Add MSYS2 MINGW64 CI job - #184
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Adds a Windows MSYS2 MinGW64 build/test job to the CI matrix, using pacman-provided Vulkan headers/loader instead of the LunarG SDK. Also guards the -lstdc++fs link on GCC >= 9, since that runtime folds std::filesystem into libstdc++ and MinGW-w64/MSYS2 toolchains don't ship a standalone stdc++fs archive.
raise(SIGTRAP) was chosen for any __GNUC__ compiler, but MinGW-w64 targets Windows, which has no SIGTRAP. Use the same inline int3 trap already used elsewhere in the platform layer for non-MSVC Windows builds.
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Summary
mingw-w64-x86_64-vulkan-develinstead of the LunarG SDK).-lstdc++fslink for GNU to GCC < 9, since GCC >= 9 (including MSYS2's toolchain) foldsstd::filesysteminto libstdc++ and doesn't ship a standalonestdc++fsarchive.Opened as a draft to validate the new CI job actually builds/passes on GitHub's Windows runners before merging.
Addresses #175.
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