Remove compatibility with OpenSSL.

Android has switched from OpenSSL to BoringSSL.  There were various
accommodations in the code for supporting both, but coming changes make
maintaining that support more difficult than it's worth, I'm abandoning
OpenSSL.

Change-Id: I9203c0215537c7f7aa2a89859ea52ff0f0582a9e
(cherry picked from commit 9011d1ae960beb29ba50634813c28892e738aac7)
8 files changed