support pthread primitives on FreeBSD #3886
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On FreeBSD, DEFAULT maps to ERRORCK. This clashes with the existing PTHREAD_MUTEX_NORMAL_FLAG: hack so we replace it by a different hack that works better cross-platform. Also fix a case of "accidental early UB" in a UB test -- pthread_mutexattr_t must be initialized.
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Fixes #3571: makes out pthread implementation support FreeBSD.
FreeBSD sets PHTREAD_MUTEX_DEFAULT == PHTREAD_MUTEX_ERRORCK, so the logic for handling "default vs explicitly set mutex kind" had to be adjusted.
The rest is just some general cleanup of the pthread logic, and I realized that we can enable the std::sync tests on Solarish.