'make test-c' passes TEST_BINS as 'tests/test_json.exe' etc.; Python's
subprocess on Windows hands that to CreateProcess, which rejects
forward-slash relative paths for the executable (WinError 2), so the
runner this script exists for (running tests from any Windows shell)
failed on every test. os.path.normpath makes it 'tests\test_json.exe'
on Windows and is a no-op elsewhere. Verified: all 8 suites run via
'make test-c' on Windows 11 / MinGW GCC 16.1 and paths are unchanged
on POSIX.
Co-authored-by: olorin <io@zyphyr.co>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Tom Olorin
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