Compiler warning when using C23: initialization discards 'const' qualifier from pointer target type

[heitbaum]

Bug description:

The second (and only other C23 discards 'const' warning)

../Objects/stringlib/fastsearch.h: In function 'ucs2lib_find_char':
../Objects/stringlib/fastsearch.h:72:35: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
   72 |                 void *candidate = memchr(p, needle,
      |                                   ^~~~~~

CPython versions tested on:

3.14

Operating systems tested on:

Linux

Linked PRs

• gh-145095

[brianschubert]

Let's track this with #145092