[GIT-PULLS] [php-src] PR #23287: sapi/fpm: remove reimplementations of (un)setenv

[email protected] (NattyNarwhal)
Newsgroups php.git-pulls
Message-ID <[email protected]> 
Pull Request: https://github.com/php/php-src/pull/23287
Author: NattyNarwhal

These are functions that have existed since Unix V7. Windows doesn't have them, but we don't support FPM on Windows (and in ext/standard, there are other ways to emulate it that don't involve WTF comments).

clearenv is kept as this was from a rejected POSIX proposal that only some systems implement (Linux, FreeBSD, some 90s Unices).

Also removes the WTF comment incidentally; see GH-23285.
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