devel/jrtplib: Switch upstream and update version

Switch upstream to Github since the previous
repo wasn't update since 2017. Also switch to
head to take advantage of bugfixes and
improvements done but never released as an
official version.

This new version add a dependency on net/libsrtp2
in order to support encrypted streams.

Major changes and improvements:

• Add support for libsrtp2
• Avoid using namespace std to allow c++14 compilation
• Added RTPRawPacket constructor which determines RTP/RTCP automatically
• Fix rtpsecuresession.cpp when thread is not supported
• Testing getifaddrs/freeifaddrs availability as well as header file
• Tried to fix the abort socket buffer filling up
• Added test program that shows bug in external transmitter
• Handling EINTR in nanosleep call
• Test to cause EINTR in poll/select
• Ignoring EINTR in poll and select calls

PR: 245577
Submitted by: yuri