Conan can't build Arrow 2.0.0 on M1
Arrow 2.0.0 doesn't recognize M1 as arm64, and tries to use x86 intrinsics. This can be worked around by applying this patch locally to the source that Conan downloads:
https://github.com/apache/arrow/commit/7df87aca022ab6a309a6ee515370686aa3bcc013