Simplify chan_h323 build to not require a second run of "make".

(closes issue #14715)
Reported by: jthurman
Patches:
      h323-makefile-1.6.2.0-beta1.patch uploaded by jthurman (license 614)
Tested by: tzafrir, russell


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@184838 65c4cc65-6c06-0410-ace0-fbb531ad65f3