When sip_ref_peer and sip_unref_peer were exported to be usable in
channels/sip/security_events.c, modifications to those functions when
building under REF_DEBUG were not taken into account. This change
moves the necessary defines into sip.h to make them accessible to
other parts of chan_sip that need them.
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@381282 65c4cc65-6c06-0410-ace0-fbb531ad65f3