wrappers: add CMake toolchain files #1296

Job	Run time
prepare	8s
linux	2h 59m 27s
linux-asserts	0s
macos	2h 6m 36s
msys2 (mingw64)	2h 9m 42s
msys2 (clang64)	1h 46m 22s
linux-test-cross-build-ffmpeg	0s
linux-cross-aarch64	3h 8m 40s
linux-cross-windows (i686, ucrt)	3h 7m 51s
linux-cross-windows (x86_64, ucrt)	3h 8m 4s
linux-cross-windows (armv7, ucrt)	2h 52m 46s
linux-cross-windows (aarch64, ucrt)	3h 8m 25s
test-compiler-rt	0s
test-libcxx	0s
test-openmp	0s
test-ffmpeg	0s
test-toolchain (x86_64)	2m 6s
test-toolchain (i686)	2m 7s
upload-nightly	0s
	1d 0h 32m 14s

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