cbsasl: Rename global openssl symbols to be prefixed with cbsasl

This caused symbol collision with openssl

Change-Id: I605b18afa5091568ef930638e154806239213370
Reviewed-on: http://review.couchbase.org/37332
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>