Allow missing AR/CC/etc tools for precompiled rubies (#394) #350

Job	Run time
docker_images (x86_64-linux)	2m 37s
docker_images (x86_64-linux-musl)	2m 13s
docker_images (aarch64-linux)	2m 21s
docker_images (aarch64-linux-musl)	2m 30s
docker_images (arm-linux)	2m 24s
docker_images (x86_64-darwin)	2m 18s
docker_images (arm64-darwin)	2m 36s
docker_images (x64-mingw32)	2m 18s
docker_images (x64-mingw-ucrt)	2m 0s
	21m 17s

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