[GIT-PULLS] [php-src] PR #22912: Prevents tests from leaking System V IPC objects

Pull Request: https://github.com/php/php-src/pull/22912
Author: NickSdot

The two tests leave System V IPC objects behind. Repeated test-suite runs can exhaust platform IPC limits and cause unrelated SysV tests to fail. Happened on macOS where the message queue limit is relatively low.

**1) `arginfo_zpp_mismatch.phpt`**
Calls every internal function with 0..8 `null` arguments. Means, 4 System V IPC functions create 3 queues, 3 shared-memory segments, and 4 semaphore sets per run -- these survive the process that created them.

The 4 affected functions are now handled early with a helper. The argument counts stay the same, but `sem_get()` and `shm_attach()` use `0600` for their permission argument, because `null` becomes `0000` which can create non-removable objects.

**2) `gh16592.phpt`**
created a message queue without removing it; now uses a private queue and cleans up after it.