norm: add patch to fix musl build

Fixes:

  http://autobuild.buildroot.net/results/9c7130d5b5aad218c5c576761d495a3f403fdc5b/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/norm/0003-remove-kernel-headers-include-musl-fix.patch

@@ -0,0 +1,55 @@
+Remove kernel header includes causing issues with musl
+
+Include the kernel headers from netfilter causes a conflict with the
+<netinet/in.h> way of defining the IPPROTO_* constants, resulting in
+the following build failure:
+
+In file included from /home/peko/autobuild/instance-0/output/host/usr/arm-buildroot-linux-musleabihf/sysroot/usr/include/netdb.h:9:0,
+                 from /home/peko/autobuild/instance-0/output/build/norm-1.5r6/protolib/include/protoAddress.h:13,
+                 from /home/peko/autobuild/instance-0/output/build/norm-1.5r6/protolib/include/protoDetour.h:5,
+                 from ../protolib/src/linux/linuxDetour.cpp:3:
+/home/peko/autobuild/instance-0/output/host/usr/arm-buildroot-linux-musleabihf/sysroot/usr/include/linux/in.h:28:3: error: expected identifier before numeric constant
+   IPPROTO_IP = 0,  /* Dummy protocol for TCP  */
+   ^
+/home/peko/autobuild/instance-0/output/host/usr/arm-buildroot-linux-musleabihf/sysroot/usr/include/linux/in.h:28:3: error: expected '}' before numeric constant
+/home/peko/autobuild/instance-0/output/host/usr/arm-buildroot-linux-musleabihf/sysroot/usr/include/linux/in.h:28:3: error: expected unqualified-id before numeric constant
+In file included from /home/peko/autobuild/instance-0/output/host/usr/arm-buildroot-linux-musleabihf/sysroot/usr/include/linux/netfilter.h:7:0,
+                 from /home/peko/autobuild/instance-0/output/host/usr/arm-buildroot-linux-musleabihf/sysroot/usr/include/linux/netfilter_ipv4.h:8,
+                 from ../protolib/src/linux/linuxDetour.cpp:10:
+/home/peko/autobuild/instance-0/output/host/usr/arm-buildroot-linux-musleabihf/sysroot/usr/include/linux/in.h:79:1: error: expected declaration before '}' token
+ };
+ ^
+
+Since from musl's developers perspective including kernel headers is
+seen as being unsafe, we simply duplicate the necessary netfilter
+definitions (there are just a few) instead of including some kernel
+headers.
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+Index: b/protolib/src/linux/linuxDetour.cpp
+===================================================================
+--- a/protolib/src/linux/linuxDetour.cpp
++++ b/protolib/src/linux/linuxDetour.cpp
+@@ -7,15 +7,18 @@
+ #include <stdlib.h>  // for atoi(), getenv()
+ #include <stdio.h>
+ #include <unistd.h>  // for close()
+-#include <linux/netfilter_ipv4.h>  // for NF_IP_LOCAL_OUT, etc
+-#include <linux/netfilter_ipv6.h>  // for NF_IP6_LOCAL_OUT, etc
+-#include <linux/netfilter.h>  // for NF_ACCEPT, etc
+ #include <libnetfilter_queue/libnetfilter_queue.h>
+ 
+ #include <fcntl.h>  // for fcntl(), etc
+ #include <linux/if_ether.h>  // for ETH_P_IP
+ #include <net/if_arp.h>   // for ARPHRD_ETHER
+ 
++/* From netfilter kernel headers */
++#define NF_IP_LOCAL_OUT		3
++
++#define NF_DROP 		0
++#define NF_ACCEPT 		1
++
+ /** NOTES: 
+  *
+  * 1) This newer implementation of LinuxDetour uses netfilter_queue