Fixed include path for plgopus for case when not building/configure directly in sipXmediaLib


git-svn-id: http://scm.sipfoundry.org/rep/sipX/main@12217 a612230a-c5fa-0310-af8b-88eea846685b
Removed duplicate SipDialog headers from include/Makefile.am


git-svn-id: http://scm.sipfoundry.org/rep/sipX/main@12218 a612230a-c5fa-0310-af8b-88eea846685b