[Wpaif]

What

tests/test_cpp_preflight.py's end-to-end case (test_library_failure_stops_check_and_build_before_reading_input) runs make_game.main() and expects the Visual Studio library check (check_cpp_library). But check_windows_sdk picks its route from the host:

• on Linux it goes to check_linux_compiler, which asks the toolchain for clang; the test's fake toolchain only answers clang++, so the case failed with AssertionError: Unexpected tool requested: clang (and then FileNotFoundError on the missing .nup);
• on Windows with the builder zip, bundled_mingw() finds llvm-mingw and the route is check_mingw, so the case would not test the Visual Studio check there either.

The case now pins make_game.LINUX to False and bundled_mingw to "", so it always exercises the route it asserts on. The other three cases were already host-neutral.

CI

The test now passes on Linux with g++, so I added it to the Linux job of source-regressions.yml (python -I -B tests/test_cpp_preflight.py --cxx g++). The docstring called it Windows-only, so if you'd rather keep it out of CI, I'm happy to drop that step.

Testing

• python -I -B tests/test_cpp_preflight.py --cxx g++ on Linux: 4/4 pass (before: 1 failure, 1 error on main).
• Using the test's own HOOKSHOT_CPP_TEST_SOURCE with a copy of make_game.py whose check_windows_sdk skips check_cpp_library: both subtests fail, so the case still catches the regression it is for.
• Not run on Windows (I only have Linux).

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