(cipher_bits_per_second): Convert return value to uint64_t to work on platforms with no floating point.
(cipher_bits_per_second): Convert return value to uint64_t to work on platforms with no floating point.

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