Fix a few compiler warnings.

git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@380735 f38db490-d61c-443f-a65b-d21fe96a405b
Ignore warnings caused by PJ_TODO()s in pjproject.

git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@380736 f38db490-d61c-443f-a65b-d21fe96a405b