zend_hrtime: Check posix clock once and prefer CLOCK_MONOTONIC_RAW #19221
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marc-mabe
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Part of #19210.
This will test the support of the monotonic timer only once at startup.
Additionally it will prefer
CLOCK_MONOTONiC_RAW(if available) to not be affected by the incremental adjustments performed by adjtime(3) and NTP.