srtp: require libsrtp2, drop support for libsrtp1
Even old old debian stable from 2019 ships with a recent-enough libsrtp2 version.
Draft for now for discussion/review, in case anyone knows a good reason why libsrtp1 support might still be needed.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Even old old debian stable from 2019 ships with a recent-enough libsrtp2 version.
Draft for now for discussion/review, in case anyone knows a good reason why libsrtp1 support might still be needed.