[Issue 19474] 64 bit version should default to architecture x86_64

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19474

--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@ibuclaw updated dlang/dmd pull request #14772 "ci: Update cirrus macOS image
to M1-based runners" mentioning this issue:

- posix.mak: Workaround issue 19474

https://github.com/dlang/dmd/pull/14772

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