MT#55283 deprectate RE_EXTERNAL switch

We don't support patching kernel source trees any more.

Change-Id: I87abd05fc11b8e2be8d36791e1945a143496de59

kernel-module/Makefile

@@ -24,8 +24,6 @@ ifeq ($(RTPENGINE_VERSION),)
 endif
 EXTRA_CFLAGS+=	-DRTPENGINE_VERSION="\"$(RTPENGINE_VERSION)\""
 
-EXTRA_CFLAGS += -D__RE_EXTERNAL
-
 obj-m        += xt_RTPENGINE.o
 
 .PHONY:		modules clean patch install

kernel-module/xt_RTPENGINE.c

@@ -32,11 +32,8 @@
 #include <linux/netfilter/x_tables.h>
 #include <linux/crc32.h>
 #include <linux/math64.h>
-#ifndef __RE_EXTERNAL
-#include <linux/netfilter/xt_RTPENGINE.h>
-#else
+
 #include "xt_RTPENGINE.h"
-#endif
 
 #include "rtpengine_config.h"