Security update for libsrtp

This update for libsrtp fixes the following issues:

- Update to 1.5.4:
* Use BE byte ordering of RTCP trailer.
* Allow zero length payload on unprotect.

- Update to new upstream release 1.5.3
* Maintenance release, including fix for CVE-2015-6360 boo#957376

Fixed bugs
bnc#957376
VUL-0: CVE-2015-6360: srtp,libsrtp: Denial of service via crafted RTP header
Selected Binaries
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