Security fix to not ignore RTCP encryption, if required.
Security fix to not ignore RTCP encryption, if required.

cuijinquan/libsrtp,cuijinquan/libsrtp,yarrcc/libsrtp-ios,yarrcc/libsrtp-ios,ksophocleous/libsrtp,persmule/libsrtp,Distrotech/libsrtp,persmule/libsrtp,Distrotech/libsrtp,yarrcc/libsrtp-ios,persmule/libsrtp,cuijinquan/libsrtp,ksophocleous/libsrtp