Build toolchain variants #1670

Job	Run time
build-toolchain (aarch64, w64-mingw32, msvcrt)	22s
build-toolchain (aarch64, w64-mingw32, ucrt)	17m 2s
build-toolchain (aarch64, pc-linux-gnu, libc)	19m 30s
build-toolchain (aarch64, pc-cygwin, msvcrt)	33m 54s
build-toolchain (x86_64, w64-mingw32, msvcrt)	22m 13s
build-toolchain (x86_64, w64-mingw32, ucrt)	22m 16s
build-toolchain (x86_64, pc-linux-gnu, libc)	24m 21s
build-toolchain (x86_64, pc-cygwin, msvcrt)	34m 34s
build-zlib	1m 7s
build-aarch64-tests (aarch64, w64-mingw32, msvcrt)	1m 4s
build-aarch64-tests (aarch64, pc-cygwin, msvcrt)	1m 8s
build-libjpeg-turbo	2m 4s
build-ffmpeg	12m 10s
build-openblas	11m 37s
build-libxml2	1m 18s
build-openssl	9m 1s
execute-aarch64-tests (aarch64, w64-mingw32, msvcrt)	52s
execute-aarch64-tests (aarch64, pc-cygwin, msvcrt)	35s
execute-libpeg-turbo-tests	2m 58s
execute-openssl-tests	39m 50s
execute-openblas-tests	45s
execute-ffmpeg-tests	34m 20s
	4h 53m 1s

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