API: Run dav1d_init under pthread_once

This makes the function thread safe, to call, for example, from multiple transient dependecies or threads.

NB: Wasn't sure if it's OK to put a global pthread_once_t variable in lib.c, or if there's a more preferred place.

added 1 commit

• 60a36f3e - API: Run dav1d_init under pthread_once

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This is missing a pthread_once() wrapper in src/win32/thread.c, and a relevant pthread_once_t typedef and PTHREAD_ONCE_INIT define in src/thread.h

added 24 commits

• 60a36f3e...3a008361 - 22 commits from branch videolan:master
• f87db5e7 - win32: Add implementation of pthread_once
• eaf974ba - API: Run dav1d_init under pthread_once

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resolved all discussions

LGTM.

resolved all discussions

Ping.

LGTM!

Regarding the styling issue, I guess this should be an extra commit (but not necessarily in this MR)

resolved all discussions

added 19 commits

• eaf974ba...cbeac008 - 17 commits from branch videolan:master
• a6853a94 - win32: Add implementation of pthread_once
• afac3d3f - API: Run dav1d_init under pthread_once

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merged