Remove unused single-byte char_is_cased() API.

Jeff Davis <jdavis@postgresql.org>

Commit: 54c41a6deb9df0868da078490ef9c26d1290e490
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2025-12-15T18:24:57Z
Remove unused single-byte char_is_cased() API.

https://postgr.es/m/450ceb6260cad30d7afdf155d991a9caafee7c0d.camel@j-davis.com

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