Viktor Szakats 6fbc9505d8 windows: use built-in _WIN32 macro to detect Windows ...

Instead of `WIN32`.

The compiler defines `_WIN32`. Windows SDK headers or build env defines
`WIN32`, or we have to take care of it. The agreement seems to be that
`_WIN32` is the preferred practice here.

Minor downside is that CMake uses `WIN32` and we also adopted it in
`Makefile.mk`.

In public libssh2 headers we stick with accepting either `_WIN32` or
`WIN32` and define our own namespaced `LIBSSH2_WIN32` based on them.

grepping for `WIN32` remains useful to detect Windows-specific code.

Closes #1195

2023-09-29 19:15:08 +00:00

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