Fix Windows.h case on Linux: use lowercase windows.h
On Linux (case-sensitive filesystem) MinGW-w64 installs the header as windows.h (lowercase) while comm.h included <Windows.h> (capital W), causing a fatal compile error when cross-compiling for Windows. Changed to <windows.h> which works on both Linux/MinGW-w64 and native Windows/MSVC (Windows header includes are case-insensitive on NTFS). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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