Fix iOS build.

src/Vehicle/Vehicle.cc

@@ -486,6 +486,7 @@ void Vehicle::_sendMessage(mavlink_message_t message)
 /// @return Direct usb connection link to board if one, NULL if none
 LinkInterface* Vehicle::priorityLink(void)
 {
+#ifndef __ios__
     foreach (LinkInterface* link, _links) {
         if (link->isConnected()) {
             SerialLink* pSerialLink = qobject_cast<SerialLink*>(link);
@@ -500,7 +501,7 @@ LinkInterface* Vehicle::priorityLink(void)
             }
         }
     }
-
+#endif
     return _links.count() ? _links[0] : NULL;
 }