Setup a windows toolchain for use on linux #23

Job	Run time
build (ubuntu-latest, Release, gcc)	3m 7s
build (ubuntu-latest, Release, clang)	4m 2s
build (ubuntu-latest, Release, mingw-w64-gcc)	4m 8s
build (ubuntu-latest, Debug, gcc)	2m 48s
build (ubuntu-latest, Debug, clang)	2m 35s
build (ubuntu-latest, Debug, mingw-w64-gcc)	3m 48s
build (windows-latest, Release, cl)	4m 56s
build (windows-latest, Debug, cl)	4m 25s
build (macos-latest, Release, gcc)	2m 55s
build (macos-latest, Release, clang)	3m 4s
build (macos-latest, Debug, gcc)	3m 23s
build (macos-latest, Debug, clang)	2m 50s
	42m 1s

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