CVS log for src/common/lib/libc/string/strlcat.c

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Keyword substitution: kv
Default branch: MAIN

string.h: Fix various symbol visibility issues.

1. Order declarations according to POSIX 2024 to make this easier to
   review side-by-side with the spec.
2. Fix visibility of memccpy: XSI-only, not POSIX in general; require
   _XOPEN_SOURCE, not just _POSIX_C_SOURCE.
3. Omit redundant _XOPEN_SOURCE test around stpcpy/stpncpy.
4. Hide strdup in POSIX 2001.  Not POSIX (without XSI) until 2008.
5. Hide strerror_r until POSIX 2001.  Can't find evidence of it in
   any earlier POSIX or X/Open.  (Not 100% sure on this one, maybe
   someone can double-check my research.)
6. Add restrict to strlcat/strlcpy.
7. Omit redundant _XOPEN_SOURCE test around strndup and strnlen.
8. Hide strtok_r until POSIX 2001.  Can't find evidence of it in
   any earlier POSIX or X/Open.  (Not 100% sure on this one, maybe
   someone can double-check my research.)

Carry the restrict qualifiers on strlcat/strlcpy to libkern too.

Main reference:
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/string.h.html

PR standards/58804: string.h: wrong visibility for memccpy

Ooops, restore accidently removed files from merge mishap

Sync with HEAD

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

resync with head

Add a (unused) variant of strlcat that uses strnlen and strlcpy to do the work.

handle fortify, ansify.

remove bogus _LIBC defines. broke lint.

Merge libkern + libc common files. As requested by core.