[Issue 24123] More importc definitions are needed for macOS

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24123

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Thank you for submitting the bug report. I created a pull request based on your
contribution.

Please submit only one issue per bugzilla issue. I took the liberty of
splitting the atomics issue into a separate issue:

https://issues.dlang.org/show_bug.cgi?id=24141

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