Don't ignore POINTOPOINT interfaces on UNIX family OSes

This patch allows Aravis to connect to cameras over POINTOPOINT IP links.  Broadcasts are not expected to work, but unicast does.  This allows connecting to cameras across a VPM, or PPPoE network.

Author: jsarrett

src/arvnetwork.c

@@ -355,7 +355,6 @@ arv_enumerate_network_interfaces (void)
 
 	for (ifap_iter = ifap; ifap_iter != NULL; ifap_iter = ifap_iter->ifa_next) {
 		if ((ifap_iter->ifa_flags & IFF_UP) != 0 &&
-			(ifap_iter->ifa_flags & IFF_POINTOPOINT) == 0 &&
 			(ifap_iter->ifa_addr != NULL) &&
 			(ifap_iter->ifa_addr->sa_family == AF_INET)) {
 			ArvNetworkInterface* a;