[ruby/prism] Remove a warning from `discarded-qualifiers`

2026-04-01T11:14:42+00:00

I've been seeing this for a while now:
```
../../../../ext/prism/../../src/memchr.c: In function ‘pm_memchr’:
../../../../ext/prism/../../src/memchr.c:35:16: warning: return discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   35 |         return memchr(memory, character, number);
      |                ^~~~~~
```

https://github.com/ruby/prism/commit/a3b1f10dbc

[ruby/prism] Make memchr implementation internal

2026-03-20T13:37:43+00:00

https://github.com/ruby/prism/commit/cdf8bed9ba

ruby.git/prism/memchr.c, branch master

[ruby/prism] Remove a warning from `discarded-qualifiers`

[ruby/prism] Make memchr implementation internal