Fix build error when chan_h323 is not being built.

(reported by cai1982 in #asterisk-dev)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@184910 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/h323/Makefile.in

@@ -24,7 +24,9 @@ ifndef OPENH323DIR
 OPENH323DIR=@OPENH323DIR@
 endif
 
+ifneq ($(wildcard $(OPENH323DIR)/openh323u.mak),)
 include $(OPENH323DIR)/openh323u.mak
+endif
 
 notrace::
 	$(MAKE) NOTRACE=1 opt