Add arm64 macOS bindings and build support

[perlun]

(See #1708)

I've generated these bindings by copying the /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk/usr/include folder from my Mac into build/headers/osx/include on a linux-amd64 machine, and executed CppSharp.Parser.Gen (after applying #1959). With this in place, and adding the change to src/CppParser/Bindings/CSharp/CppSharp.Parser.CSharp.csproj, we get slightly closer to building on macOS... but we're note quite there yet. Running ./build.sh -configuration Release on my Mac gives me this now:

  CppSharp.Parser net10.0 succeeded (0.2s) → /Users/per/git/CppSharp/bin/Release/CppSharp.Parser.dll
  CppSharp.Generator net10.0 succeeded (0.5s) → /Users/per/git/CppSharp/bin/Release/CppSharp.Generator.dll
  Encodings.Gen net10.0 failed with 1 error(s) (1.8s) → /Users/per/git/CppSharp/bin/Release/Encodings.Gen.dll
    /Users/per/.dotnet/sdk/10.0.102/Microsoft.Common.CurrentVersion.targets(6046,5): error MSB3073: The command "dotnet "/Users/per/git/CppSharp/bin/Release/Encodings.Gen.dll"" exited with code 134.
  Encodings.Tests.CSharp net10.0 failed with 1 warning(s) (0.0s)
    /Users/per/git/CppSharp/tests/dotnet/Encodings/Encodings.Tests.CSharp.csproj : warning NU1903: Package 'Newtonsoft.Json' 9.0.1 has a known high severity vulnerability, https://github.com/advisories/GHSA-5crp-9r3c-p9vr
  VTables.Gen net10.0 failed with 1 error(s) (0.5s) → /Users/per/git/CppSharp/bin/Release/VTables.Gen.dll
    /Users/per/.dotnet/sdk/10.0.102/Microsoft.Common.CurrentVersion.targets(6046,5): error MSB3073: The command "dotnet "/Users/per/git/CppSharp/bin/Release/VTables.Gen.dll"" exited with code 134.
  VTables.Tests.CSharp net10.0 failed with 1 warning(s) (0.0s)
    /Users/per/git/CppSharp/tests/dotnet/VTables/VTables.Tests.CSharp.csproj : warning NU1903: Package 'Newtonsoft.Json' 9.0.1 has a known high severity vulnerability, https://github.com/advisories/GHSA-5crp-9r3c-p9vr
  CLI.Gen net10.0 failed with 1 error(s) (0.5s) → /Users/per/git/CppSharp/bin/Release/CLI.Gen.dll
    /Users/per/.dotnet/sdk/10.0.102/Microsoft.Common.CurrentVersion.targets(6046,5): error MSB3073: The command "dotnet "/Users/per/git/CppSharp/bin/Release/CLI.Gen.dll"" exited with code 134.
  CSharp.Gen net10.0 failed with 1 error(s) (0.5s) → /Users/per/git/CppSharp/bin/Release/CSharp.Gen.dll
    /Users/per/.dotnet/sdk/10.0.102/Microsoft.Common.CurrentVersion.targets(6046,5): error MSB3073: The command "dotnet "/Users/per/git/CppSharp/bin/Release/CSharp.Gen.dll"" exited with code 134.
  CppSharp.Parser.Gen net10.0 succeeded (0.1s) → /Users/per/git/CppSharp/bin/Release/CppSharp.Parser.Gen.dll
  CppSharp.CLI net10.0 succeeded (0.1s) → /Users/per/git/CppSharp/bin/Release/CppSharp.CLI.dll
  Common.Gen net10.0 failed with 1 error(s) (0.6s) → /Users/per/git/CppSharp/bin/Release/Common.Gen.dll
    /Users/per/.dotnet/sdk/10.0.102/Microsoft.Common.CurrentVersion.targets(6046,5): error MSB3073: The command "dotnet "/Users/per/git/CppSharp/bin/Release/Common.Gen.dll"" exited with code 134.
  Common.Tests.CSharp net10.0 failed with 1 warning(s) (0.0s)
    /Users/per/git/CppSharp/tests/dotnet/Common/Common.Tests.CSharp.csproj : warning NU1903: Package 'Newtonsoft.Json' 9.0.1 has a known high severity vulnerability, https://github.com/advisories/GHSA-5crp-9r3c-p9vr
  StandardLib.Gen net10.0 failed with 1 error(s) (0.5s) → /Users/per/git/CppSharp/bin/Release/StandardLib.Gen.dll
    /Users/per/.dotnet/sdk/10.0.102/Microsoft.Common.CurrentVersion.targets(6046,5): error MSB3073: The command "dotnet "/Users/per/git/CppSharp/bin/Release/StandardLib.Gen.dll"" exited with code 134.
  CSharp.Tests.CSharp net10.0 failed with 1 warning(s) (0.0s)
    /Users/per/git/CppSharp/tests/dotnet/CSharp/CSharp.Tests.CSharp.csproj : warning NU1903: Package 'Newtonsoft.Json' 9.0.1 has a known high severity vulnerability, https://github.com/advisories/GHSA-5crp-9r3c-p9vr
  CppSharp.Generator.Tests net10.0 succeeded with 1 warning(s) (0.1s) → /Users/per/git/CppSharp/bin/Release/CppSharp.Generator.Tests.dll
    /Users/per/git/CppSharp/src/Generator.Tests/CppSharp.Generator.Tests.csproj : warning NU1903: Package 'Newtonsoft.Json' 9.0.1 has a known high severity vulnerability, https://github.com/advisories/GHSA-5crp-9r3c-p9vr
  NamespacesDerived.Gen net10.0 failed with 1 error(s) (0.3s) → /Users/per/git/CppSharp/bin/Release/NamespacesDerived.Gen.dll
    /Users/per/.dotnet/sdk/10.0.102/Microsoft.Common.CurrentVersion.targets(6046,5): error MSB3073: The command "dotnet "/Users/per/git/CppSharp/bin/Release/NamespacesDerived.Gen.dll"" exited with code 134.
  NamespacesDerived.Tests.CSharp net10.0 failed with 1 warning(s) (0.0s)

And trying to run one of these Gen-programs manually gives me this:

❯ dotnet "/Users/per/git/CppSharp/bin/Release/Encodings.Gen.dll"

Generating bindings for Encodings (CSharp)
Unhandled exception. System.EntryPointNotFoundException: Unable to find an entry point named '?' in shared library 'Std-symbols'.
   at Std.BasicStringExtensions.__Internal.Data(IntPtr __instance)
   at Std.BasicStringExtensions.__Internal.Data(IntPtr __instance)
   at Std.BasicStringExtensions.Data(BasicString`3 this) in /Users/per/git/CppSharp/src/CppParser/Bindings/CSharp/arm64-apple-darwin12.4.0/Std.cs:line 525
   at CppSharp.Parser.AST.NativeLibrary.get_FileName() in /Users/per/git/CppSharp/src/CppParser/Bindings/CSharp/arm64-apple-darwin12.4.0/CppSharp.CppParser.cs:line 248
   at CppSharp.ClangParser.ConvertLibrary(NativeLibrary library) in /Users/per/git/CppSharp/src/Parser/Parser.cs:line 70
   at CppSharp.Driver.ParseLibraries() in /Users/per/git/CppSharp/src/Generator/Driver.cs:line 190
   at CppSharp.ConsoleDriver.Run(ILibrary library) in /Users/per/git/CppSharp/src/Generator/Driver.cs:line 426
   at CppSharp.Tests.EncodingsTestsGenerator.Main(String[] args) in /Users/per/git/CppSharp/tests/dotnet/Encodings/Encodings.Gen.cs:line 27
Abort trap: 6

The error indicates that something is wrong with Std-symbols, which does not seem to have been properly compiled. On my Mac:

❯ find . -name Std-symbols\*
./build/gmake/projects/Std-symbols.make
./src/CppParser/Bindings/CSharp/x86_64-linux-gnu-cxx11abi/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/x86_64-pc-win32-msvc-d/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/x86_64-pc-win32-msvc/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/i686-pc-win32-msvc-d/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/x86_64-apple-darwin12.4.0/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/x86_64-linux-gnu/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/i686-pc-win32-msvc/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/arm64-apple-darwin12.4.0/Std-symbols.cpp
./src/CppParser/Bindings/CSharp/i686-apple-darwin12.4.0/Std-symbols.cpp

On my Linux machine, the .o files for this file exists (below), so I presume that there's some more file that needs to be tweaked for it to be generated during the build. Do you happen to know where this is controlled?

❯ find . -name Std-symbols\*.o
./build/obj/Std-symbols/DebugOpt/Std-symbols.o
./build/obj/Std-symbols/Release/Std-symbols.o
./build/gen/Common/Std-symbols.o
./build/gen/Encodings/Std-symbols.o
./build/gen/VTables/Std-symbols.o
./build/gen/CSharp/Std-symbols.o