Use SRWLocks to implement locking on Windows #17927

Jigsaw52requested to merge
Jigsaw52/tor:ticket17927_srw_locks_win32 into master

Github PR: https://github.com/torproject/tor/pull/2111

Replace the Windows locking implementation which used critical sections with the faster SRWLocks available since Vista.

Closes ticket #17927 (closed)

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