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Fixes for UBsan issues

Henrik Gramner requested to merge gramner/dav1d:ubsan_fixes_2312 into master

For testing spurious wakeups I temporarily redefined pthread_cond_wait() to a sequence of unlock(), sleep(), lock(). Prior to this MR doing so would randomly cause dav1d_apply_grain() to return before the grain application was completed, leading to various issues. It now passes all tests.

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