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The "progress2" API in pthread_slice.c currently associates a progress value with a thread rather than a job, relying on the broken assumption that a job's thread number is equal to its job number modulo thread count. This removes this API entirely, and changes hevcdec to use a ThreadProgress-based implementation that associates a mutex/cond/progress value with every job. Fixes races and deadlocks in hevdec with slice threading, e.g. some of those mentioned in #11221.