Is _WIN32 set for cross builds?

_WIN32 is set in compiler which targets Windows platform - no header or IDE is required. You can verify that using cc -dM -E - < /dev/null | grep WIN32 command.

Yep, looks good.
This is in a Docker container running the image we use in CI for cross-compilation:

root@470e6364089b:/build# x86_64-w64-mingw32-gcc -dM -E - < /dev/null | grep WIN32
#define __WIN32__ 1
#define _WIN32 1
#define WIN32 1
#define __WIN32 1

And natively in MSYS2 on Windows:

$ cc -dM -E - < /dev/null | grep WIN32
137:#define __WIN32__ 1
183:#define _WIN32 1
301:#define WIN32 1
325:#define __WIN32 1

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