use backslashes to escape quotes on windows when we are not using cmd.exe to run something

Author: timfel

graalpython/lib-graalpython/patches/numpy/numpy-1.26.4.patch

@@ -1,16 +1,5 @@
 diff --git a/numpy/core/include/numpy/ndarrayobject.h b/numpy/core/include/numpy/ndarrayobject.h
 index d4b73eb..af90a68 100644
---- a/numpy/_build_utils/gitversion.py
-+++ b/numpy/_build_utils/gitversion.py
-@@ -28,7 +28,7 @@ def git_version(version):
-     git_hash = ''
-     try:
-         p = subprocess.Popen(
--            ['git', 'log', '-1', '--format="%H %aI"'],
-+            ['git', 'log', '-1', "--format='%H %aI'"],  # Workaround for GraalPy's emulated posix backend on Windows
-             stdout=subprocess.PIPE,
-             stderr=subprocess.PIPE,
-             cwd=os.path.dirname(__file__),
 --- a/vendored-meson/meson/mesonbuild/utils/universal.py
 +++ b/vendored-meson/meson/mesonbuild/utils/universal.py
 @@ -727,6 +727,7 @@ def windows_detect_native_arch() -> str:

graalpython/lib-python/3/subprocess.py

@@ -1826,20 +1826,21 @@ def _execute_child(self, args, executable, preexec_fn, close_fds,
                         args = [comspec, "/u", "/c", *args]
                     else:
                         args = [comspec, "/u", "/c", list2cmdline(args)]
-                for idx, arg in enumerate(args):
-                    # Adapted per the quoting rules from
-                    # https://learn.microsoft.com/en-us/cpp/c-language/parsing-c-command-line-arguments
-                    if idx == 0:
-                        continue
-                    modified = False
-                    if '"' in args[idx]:
-                        args[idx] = args[idx].replace('"', '""')
-                        modified = True
-                    if '\\' in args[idx] and (shell or modified):
-                        args[idx] = args[idx].replace('\\', '\\\\')
-                        modified = True
-                    if modified:
-                        warnings.warn(f"Replacing\n\t{arg!r}\nwith\n\t{args[idx]!r}", RuntimeWarning)
+                else:
+                    for idx, arg in enumerate(args):
+                        # Adapted per the quoting rules from
+                        # https://learn.microsoft.com/en-us/cpp/c-language/parsing-c-command-line-arguments
+                        if idx == 0:
+                            continue
+                        modified = False
+                        if '\\' in args[idx] and (shell or modified):
+                            args[idx] = args[idx].replace('\\', '\\\\')
+                            modified = True
+                        if '"' in args[idx]:
+                            args[idx] = args[idx].replace('"', '\\"')
+                            modified = True
+                        if modified:
+                            warnings.warn(f"Replacing\n\t{arg!r}\nwith\n\t{args[idx]!r}", RuntimeWarning)
             # End Truffle change
 
             if shell: