[Issue 24725] core.sys.linux: feature detect glibc functions at build time

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24725

--- Comment #2 from Andrei Horodniceanu <a.horodniceanu at proton.me> ---
I've submitted a draft PR with a sample implementation for dmd. I have chosen
the solution which checks for an individual function.

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