Honor the contents of the COPTS variable as custom target CFLAGS. Apparently

this is what openwrt does.  
(reported by Brian Capouch on the asterisk-dev list, patch by me)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@80257 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile

@@ -73,6 +73,10 @@ ifneq ($(wildcard makeopts),)
   include makeopts
 endif
 
+# Some build systems, such as the one in openwrt, like to pass custom target
+# CFLAGS in the COPTS variable.
+ASTCFLAGS+=$(COPTS)
+
 #Uncomment this to see all build commands instead of 'quiet' output
 #NOISY_BUILD=yes