jbauch 03fa534fcc Support getting external HMAC auth context with libsrtp 2.1.0.
This is in preparation of upgrading to libsrtp 2.1.0.

BUG=webrtc:7856

Review-Url: https://codereview.webrtc.org/2958123002
Cr-Commit-Position: refs/heads/master@{#18805}
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