gh-140266: Fix empty platform in build-details.json when using --with-build-python #142375
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gh-140266: Fix build-details platform handling for non-cross builds
Key changes:
Treat empty _PYTHON_HOST_PLATFORM the same as unset in sysconfig.get_platform().
Ensures non-cross builds with --with-build-python generate correct platform value (e.g. linux-x86_64) instead of empty string.
Adjusted test_traceback so the Windows-only test is skipped on non-Windows platforms.
All tests pass on Linux/WSL after the fix.
A NEWS entry has been added.