add compiling.txt

src/mod/endpoints/mod_h323/changes.txt

-set network_addr of caller profile to signaling ip address. (requested by Steven Ayre)
 move PTrace level set to FSH323EndPoint::Initialise
 partially apply patch from from Peter Olsson, Remove UnLock() when TryLock() failed and DEBUG_RTP_PACKETS directive.
 apply changes from mod_h323-patch.diff by Peter Olsson.

src/mod/endpoints/mod_h323/compiling.txt

+To compile this module use latest ptlib/h323plis combinations listed at http://www.gnugk.org/compiling-gnugk.html