ensure that if a .i file (preprocessed source) is present, the .o file is made from it, not from the .c file (this only works because GNU makes respects the order the rules are defined)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@157167 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile.rules

@@ -43,14 +43,14 @@ ifeq ($(findstring DONT_OPTIMIZE,$(MENUSELECT_CFLAGS)),)
 endif
 
 # build rules for various targets
-%.o: %.c
-	$(ECHO_PREFIX) echo "   [CC] $< -> $@"
-	$(CMD_PREFIX) $(CC) -o $@ -c $< $(PTHREAD_CFLAGS) $(ASTCFLAGS) $(MAKE_DEPS)
-
 %.o: %.i
 	$(ECHO_PREFIX) echo "   [CCi] $< -> $@"
 	$(CMD_PREFIX) $(CC) -o $@ -c $< $(PTHREAD_CFLAGS) $(ASTCFLAGS) $(MAKE_DEPS)
 
+%.o: %.c
+	$(ECHO_PREFIX) echo "   [CC] $< -> $@"
+	$(CMD_PREFIX) $(CC) -o $@ -c $< $(PTHREAD_CFLAGS) $(ASTCFLAGS) $(MAKE_DEPS)
+
 %.i: %.c
 	$(ECHO_PREFIX) echo "   [CPP] $< -> $@"
 	$(CMD_PREFIX) $(CC) -o $@ -E $< $(PTHREAD_CFLAGS) $(ASTCFLAGS) $(MAKE_DEPS)