Autotools: Simplify POSIX Threads check #14855
Merged
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The PTHREADS_CHECK is using cache variables so it is run only once early during the configuration phase, before including SAPI and other M4 files. This removes the TSRM_CHECK_PTHREADS macro and moves the POSIX Threads check after the PHP_THREAD_SAFETY variable is set in configure.ac.
The check and error throw in PHP_BUILD_THREAD_SAFE is also joined into this single check.
This removes the redundant tsrm.m4 file and PHP_CONFIGURE_PART call for TSRM as it doesn't run any configuration checks anymore.