Make tpacket_req3 definition conditional

The makefile includes need to be moved for everything to be
defined properly when the configure tests run.

The Ubuntu 12.04 x86_64 GCC and Linaro's 13.08 and newer AArch64
GCC's have the if_packet.h kernel header, but as of 13.12,
the Linaro AArch32 GCC does not.

Change-Id: I363c43fdb81b028f99aac77e15bff9462c87af4b
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile

@@ -19,9 +19,6 @@ export VERSION_SO_MAJOR VERSION_SO_MINOR
 #
 #MAKEFLAGS := -r -R
 
-include Makefile.inc
-include Makefile.config
-
 #
 # Common definitions
 #
@@ -114,6 +111,8 @@ export CC MAKE CFLAGS LIBS ARCH DEFINES MAKEFLAGS CRIU-SO
 export SRC_DIR SYSCALL-LIB SH RM ARCH_DIR OBJCOPY LDARCH LD
 export cflags-y
 
+include Makefile.inc
+include Makefile.config
 include scripts/Makefile.version
 include scripts/Makefile.rules
 

include/sk-packet.h

@@ -22,7 +22,9 @@ extern int packet_receive_one(struct nlmsghdr *h, void *arg);
 
 #ifndef PACKET_FANOUT
 #define PACKET_FANOUT	18
+#endif
 
+#ifndef TPACKET3_HDRLEN
 struct tpacket_req3 {
 	unsigned int tp_block_size;
 	unsigned int tp_block_nr;