pthread_self returns a pthread_t which is not an unsigned int on all

pthread implementations. Casting it to an unsigned int fixes compiler warnings.

Tested on OpenBSD and Linux both 32 and 64 bit


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@205532 65c4cc65-6c06-0410-ace0-fbb531ad65f3