[libc-commits] [libc] [libc][complex] Silence `pedantic` warning (PR #112239)

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lntue wrote:

> Not sure we want to just silence all of these warnings, the issue seems to be redeclaration of some complex types, we could probably just use the compiler ones.

So this is the issue: https://godbolt.org/z/zs5Px5Tco
And for some reason, adding `Wno-c99-extensions` there still not suppresses `_Complex` warnings.

https://github.com/llvm/llvm-project/pull/112239