Update omnibus
build instructions for aarch64 runner
#320
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The updated recipes should build on both, x86_64 and arm64 machines.
I have not tested them on x86_64 though.
To fix CI, only arm64 matters.
CI workflow run: https://app.circleci.com/pipelines/github/crystal-lang/crystal/15386/workflows/76ecd816-2187-4eed-aef2-a4959240f1b2/jobs/84572
Resolves #318