fix: Postgres build with ancient libc

[dunglas]

What does this PR do?

Closes #1027

This should fix the build of recent Postgres versions with ancient GNU libc versions.

This code block isn't necessary anymore because of postgres/postgres@3e83bdd

Failing FrankenPHP PR: https://github.com/php/frankenphp/actions/runs/21904413354/job/63240864704

I'm not sure how to test this properly.

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