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retain const qualifier from pointer

Since glibc-2.43:

For ISO C23, the functions bsearch, memchr, strchr, strpbrk, strrchr, strstr, wcschr, wcspbrk, wcsrchr, wcsstr and wmemchr that return pointers into their input arrays now have definitions as macros that return a pointer to a const-qualified type when the in put argument is a pointer to a const-qualified type.

https://lists.gnu.org/archive/html/info-gnu/2026-01/msg00005.html

fixes the follow warnings:
- warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]

Signed-off-by: Rudi Heitbaum <rudi@heitbaum.com>

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