fix: prefer MSVC over MinGW for Windows bootstrap#19
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GHA Windows runners have MSVC (Visual Studio Build Tools) available, which provides the POSIX-compatible headers V needs. The previous code forced MinGW with -gcc, which lacks sys/mman.h, termios.h, and pthread types, causing bootstrap failures. Try MSVC first (no -gcc flag), fall back to GCC only if MSVC fails. Closes #15
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Summary
GHA Windows runners have MSVC (Visual Studio Build Tools) available, which provides the POSIX-compatible headers V needs for bootstrap. The previous code forced MinGW with -gcc, which lacks sys/mman.h, termios.h, and pthread types, causing bootstrap failures on windows-latest.
This PR changes the Windows build to try MSVC first (no -gcc flag), falling back to GCC only if MSVC fails.
Closes #15
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