Now that WebRTC requires OpenSSL 1.1.0 as minimum, some bits can be
removed. The simpler versioning API is shared between BoringSSL and
OpenSSL 1.1.0, and there are some remnants of the threading callbacks
that can be removed.
Bug: none
Change-Id: I2078ca9c444b1f1efa9e4b235eb4e6037865d8fb
Reviewed-on: https://webrtc-review.googlesource.com/c/120261
Commit-Queue: David Benjamin <davidben@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Benjamin Wright <benwright@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26475}