Revert "Disable coreutils on M1 Apple Silicon with arm64 (#2020)"

[native-api]

This reverts commit 90d0d20.

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Description

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After further consideration, we've decided to remove this workaround:

• It only has an effect if the user has added gnubin from Homebrew Coreutils to PATH which is an unsupported setup
• It was intended to be applied only to a few select 3.8 and 3.9 versions that officially support Apple Silicon and only fail with Homebrew Coreutils in PATH because they have config.* from a too old version of Autoconf that doesn't support the Arm64 arch -- but
  • CPython devs didn't actually fix the problem in 3.10, either, only in 3.11, so we'd need to apply it to all 3.10 releases, too
  • users started pushing this workaround into other unrelated branches because they were using the above unsupported setup. See Fix Python 3.7.12 compilation on macOS arm64/M1. #2190 (review) for discussion.

Tests

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[native-api]

@yackrru Be advised that we're removing this workaround, see above for the reasons.