Discovered in experiments on core files: if you wrap the lock and unlock calls...

Discovered in experiments on core files: if you wrap the lock and unlock calls with sip_pvt_lock and sip_pvt_unlock, you lose the tracing info you would normally get via DETECT_DEADLOCKS; so I turn these two functions into macros when DETECT_DEADLOCKS is called. This way, you get meaningful stuff in the file and func slots in the lock_info struct.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@77810 65c4cc65-6c06-0410-ace0-fbb531ad65f3