ASTCFLAGS, instead of at the end. This way, we ensure that we find the local
headers first before accidentally trying to use headers that exist in
locations specified in the ASTCFLAGS passed from the main Makefile.
(issue #8637, ovi)
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@53497 65c4cc65-6c06-0410-ace0-fbb531ad65f3