Enable ip commands to be compiled seperate from ip, modifed patch from Bastian Blank
diff --git a/networking/libiproute/ip_common.h b/networking/libiproute/ip_common.h
index 5ac4321..771ca48 100644
--- a/networking/libiproute/ip_common.h
+++ b/networking/libiproute/ip_common.h
@@ -1,3 +1,7 @@
+extern int preferred_family;
+extern char * _SL_;
+
+extern void ip_parse_common_args(int *argcp, char ***argvp);
extern int print_linkinfo(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
extern int print_addrinfo(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
extern int print_neigh(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);