Feature/mingw toolchain #26

Job	Run time
build (ubuntu-latest, Release, gcc)	3m 13s
build (ubuntu-latest, Release, clang)	3m 25s
build (ubuntu-latest, Release, mingw-w64-gcc)	2m 44s
build (ubuntu-latest, Debug, gcc)	2m 35s
build (ubuntu-latest, Debug, clang)	1m 59s
build (ubuntu-latest, Debug, mingw-w64-gcc)	3m 42s
build (windows-latest, Release, cl)	5m 1s
build (windows-latest, Debug, cl)	4m 35s
build (macos-latest, Release, gcc)	2m 59s
build (macos-latest, Release, clang)	2m 57s
build (macos-latest, Debug, gcc)	2m 55s
build (macos-latest, Debug, clang)	2m 56s
	39m 1s

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