Add C23 header translations to druntime

[fithisux]

My rationale is that a big push is happening to migrate code bases to C23 and betterC can't be left behind.

If it is already compliant please ignore my request.

[dkorpel]

Do you mean ImportC?

[fithisux]

@dkorpel No betterC, whatever new functions in stdc are added. Currently C99+C11 are supported.

See section "new functions": https://en.wikipedia.org/wiki/C23_(C_standard_revision)

[dkorpel]

Oh, so you want new C23 bindings in druntime?

[fithisux]

Yes, if they are available. Conditionally on some flag I suppose. Not of high priority, just to keep it in mind.

[dkorpel]

Okay, then I'll mark this as a druntime enhancement. I don't see anything related to -betterC specifically, which is the subset of D features that work when only linking C's runtime lib as apposed to full D runtime.