config.h: removed check of non-builtin define for USE_UNIX_BACKTRACE_SUPPORT / hardened print_stacktrace()

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Prerequisite for #7296 which will remove the only include from config.h leading to features.h to be not included anymore and __GLIB__ never be defined.

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In case this might lead to some platform which no longer includes the stacktrace you can still manually pass USE_UNIX_BACKTRACE_SUPPORT to the build. Unlikely though since I doubt anybody is really leveraging this (there's https://trac.cppcheck.net/ticket/11255 about using it in daca instead of gdb).

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macos-13 does not return anything from backtrace().

The macos-15 output looks like this:

0   test-signalhandler                  0x0000000100dbf42c _Z16print_stacktraceP7__sFILEibib + 124
1   test-signalhandler                  0x0000000100dbbf84 _ZL21CppcheckSignalHandleriP9__siginfoPv + 1628
2   libsystem_platform.dylib            0x0000000190d7c624 _sigtramp + 56
3   libsystem_pthread.dylib             0x0000000190d4288c pthread_kill + 296
4   libsystem_c.dylib                   0x0000000190c4bc60 abort + 124
5   test-signalhandler                  0x0000000100dbb404 _Z7my_segvv + 0

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For comparison the ubuntu-22.04 (sans the top frame) looks like this:

./test-signalhandler(_Z16print_stacktraceP8_IO_FILEibib+0xa1) [0x55cb65e41464]
./test-signalhandler(+0xf9d9) [0x55cb65e3c9d9]
/lib/x86_64-linux-gnu/libc.so.6(+0x42520) [0x7f2c97c42520]
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x12c) [0x7f2c97c969fc]
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x7f2c97c42476]
/lib/x86_64-linux-gnu/libc.so.6(abort+0xd3) [0x7f2c97c287f3]
./test-signalhandler(_Z7my_segvv+0) [0x55cb65e3b906]
./test-signalhandler(main+0x7e) [0x55cb65e3b9df]
/lib/x86_64-linux-gnu/libc.so.6(+0x29d90) [0x7f2c97c29d90]

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I filed https://trac.cppcheck.net/ticket/14096 about supporting it on macOS.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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I filed https://trac.cppcheck.net/ticket/14094 about detecting the shortcomings I fixed in print_stacktrace().