netfid: fix build on musl

AF_INET* is provided by sys/socket.h

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 34310

package/network/config/netifd/patches/001-musl_af_inet_include.patch

@@ -0,0 +1,11 @@
+diff -urN netifd-2012-10-29/utils.c netifd-2012-10-29.new/utils.c
+--- netifd-2012-10-29/utils.c	2012-11-23 17:15:39.000000000 +0100
++++ netifd-2012-10-29.new/utils.c	2012-11-23 17:16:53.409244361 +0100
+@@ -17,6 +17,7 @@
+ 
+ #include <arpa/inet.h>
+ #include <netinet/in.h>
++#include <sys/socket.h>
+ 
+ void
+ __vlist_simple_init(struct vlist_simple_tree *tree, int offset)