res/res_hep_rtcp: Remove dependency on PJSIP

res/res_hep_rtcp: Remove dependency on PJSIP

The res_hep_rtcp module was incorrectly including <pjsip.h>. This didn't need
to be included, as the module does not using PJPROJECT any fashion.
Unfortunately, because res_hep_rtcp did not include pjsip in its MODULEINFO as
a dependency, this also meant that res_hep_rtcp will fail to compile on a
system without PJPROJECT.

This patch removes the include.

Thanks to Damien Wedhorn for pointing this out in #asterisk-dev.

ASTERISK-24236 #close
Reported by: Damien Wedhorn, Matt Jordan
Tested by: Damien Wedhorn

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@421064 65c4cc65-6c06-0410-ace0-fbb531ad65f3