av_lockmgr_register is deprecated and no-op since
a04c2c707d
Bug: webrtc:8745
Change-Id: I284c9a6edf88a584c3a5cb5dfae4ccf1be1f8851
Reviewed-on: https://webrtc-review.googlesource.com/39503
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23508}