iptrtpproxy: minor makefile update

- use INCLUDES instead of DEFS+=-I...

modules/iptrtpproxy/Makefile

@@ -11,8 +11,9 @@ iptdir = ~/work/netfilter/iptables
 include ../../Makefile.defs
 auto_gen=
 NAME=iptrtpproxy.so
-LIBS += $(iptdir)/iptables.o -L $(iptdir)/libiptc -liptc -L $(iptdir)/extensions -lext
-DEFS += -I $(iptdir)/include
+LIBS += $(iptdir)/iptables.o -L $(iptdir)/libiptc -liptc \
+		-L $(iptdir)/extensions -lext
+INCLUDES = -I $(iptdir)/include
 
 DEFS+=-DSER_MOD_INTERFACE