build-llvm: Apply a patch to be tested #1245

Job	Run time
prepare	17s
linux	29m 16s
linux-asserts	29m 21s
macos	29m 20s
msys2 (mingw64)	29m 10s
msys2 (clang64)	29m 8s
linux-cross-windows	1s
linux-cross-aarch64	1s
test-ffmpeg	1s
test-libcxx	1s
test-openmp	1s
test-compiler-rt	1s
test-toolchain	1s
test-toolchain-cmd	1s
linux-test-cross-build-ffmpeg	1s
upload-nightly	1s
	2h 26m 42s

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