standards/58605: C23: __STDC_*_H__ versions

[campbell+netbsd%mumble.net@localhost]

>Number:         58605
>Category:       standards
>Synopsis:       C23: __STDC_*_H__ versions
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    standards-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 16 11:00:01 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9
>Organization:
The __STDC_NETBSD_H__ Version >= 202311L
>Environment:
>Description:
C23 adds __STDC_*_H__ version number macros for its header files, such as this one in <uchar.h>:

#define	__STDC_VERSION_UCHAR_H__	202311L

I added that when creating the new <uchar.h>, but all the other header files need these too.
>How-To-Repeat:
code inspection
>Fix:
Yes, please!