Changes

deps/Makefile: update titan.ProtocolModules.RTP

The module titan.ProtocolModules.RTP received a fix that avoids crashing
(segfault) on the reception of short RTP packets. Let's make sure that
this fix is included in our builds as well.

Related: OS#4005
Change-Id: Ica445c1058f3afa1e0615986ca5240eeacb02e8c