Fix default CPU for macOS and iOS #14816
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Since M1 support was added we started defaulting the CPU for macOS and
iOS builds to the host CPU in the case another CPU wasn't passed. This
change mirrors #13873, #13440 and https://github.com/bazelbuild/rules_apple//commit/99e5b631bf060358241a8eaabd285be5c120490f
in the newer starlark transition.
Without this you end up with architecture mismatches for builds. Fixes #14803