Setup a windows toolchain for use on linux #25

Job	Run time
build (ubuntu-latest, Release, gcc)	3m 13s
build (ubuntu-latest, Release, clang)	3m 9s
build (ubuntu-latest, Release, mingw-w64-gcc)	2m 26s
build (ubuntu-latest, Debug, gcc)	2m 47s
build (ubuntu-latest, Debug, clang)	1m 50s
build (ubuntu-latest, Debug, mingw-w64-gcc)	3m 24s
build (windows-latest, Release, cl)	5m 26s
build (windows-latest, Debug, cl)	4m 45s
build (macos-latest, Release, gcc)	2m 59s
build (macos-latest, Release, clang)	2m 55s
build (macos-latest, Debug, gcc)	2m 47s
build (macos-latest, Debug, clang)	3m 1s
	38m 42s

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