Allow using msys2 instead of cygwin #857
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This patch provides support for using msys2 instead of cygwin as the environment for windows. It can be enabled with:
Otherwise, it still defaults to cygwin.
It will use the msys2 installation specified as follows:
MSYS2_ROOTenvironment variablePATH, it will use the installation that the pacman binary belongs to.C:\msys64(available in the windows image for github actions: https://github.com/actions/runner-images/blob/main/images/windows/Windows2022-Readme.md#msys2).It does not cache the msys2 install, but it should be possible for setup-msys2 to handle that: https://github.com/msys2/setup-msys2.
This closes #846.