Support build with disabled zend signals

[bwoebi]

I seem to have taken care about the globals, but missed zend_signal_handler_unblock.

Also adding a test for that scenario.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.21%. Comparing base (65d305a) to head (7230f6d). Report is 2 commits behind head on master.

Additional details and impacted files

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Benchmarks [ tracer ]

Benchmark execution time: 2024-10-14 02:34:12

Comparing candidate commit 7230f6d60b1627fca81c37ff3ac9b53885a51183 in PR branch bob/zend-signals-dsiabled with baseline commit 65d305a07c65e8df487a51a7061ae1ed2e1a2449 in branch master.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 176 metrics, 0 unstable metrics.

scenario:PDOBench/benchPDOBaseline-opcache

• 🟩 execution_time [-14.444µs; -13.543µs] or [-7.440%; -6.976%]

scenario:PDOBench/benchPDOOverheadWithDBM-opcache

• 🟩 execution_time [-27.820µs; -16.030µs] or [-3.803%; -2.191%]