Add support for compiling G-P using MSYS2/MINGW.

The MINGW check is copied shameless from Geany :).
The path fixups are those which we had for ages in the Waf
build system but never in Autotools.

With those changes, G-P actually start working on Windows.

You can view, comment on, or merge this pull request online at:

  https://github.com/geany/geany-plugins/pull/374

Commit Summary

• Windows/Mingw support: add check for MINGW environment
• Windows/Mingw support: set appropriate compile-time paths for Windows

File Changes

• M build/common.m4 (17)
• M build/vars.build.mk (19)
• M configure.ac (1)

Patch Links:

• https://github.com/geany/geany-plugins/pull/374.patch
• https://github.com/geany/geany-plugins/pull/374.diff

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