wrappers: add CMake toolchain files #194

Job	Run time
prepare	4s
linux	2h 57m 5s
macos	2h 3m 17s
msys2 (mingw64)	2h 10m 50s
linux-asserts	0s
msys2 (clang64)	1h 49m 3s
linux-test-cross-build-ffmpeg	0s
linux-cross-aarch64	3h 6m 32s
linux-cross-windows (i686, ucrt)	3h 6m 38s
linux-cross-windows (x86_64, ucrt)	3h 7m 42s
linux-cross-windows (armv7, ucrt)	3h 2m 41s
linux-cross-windows (aarch64, ucrt)	3h 7m 19s
test-libcxx	0s
test-ffmpeg	0s
test-openmp	0s
test-compiler-rt	0s
test-toolchain (x86_64)	2m 3s
test-toolchain (i686)	2m 6s
upload-nightly	0s
	1d 0h 35m 20s

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