properly filter disconnected interfaces on win32

panda/src/net/connectionManager.cxx

@@ -534,6 +534,7 @@ scan_interfaces() {
     if (result == ERROR_SUCCESS) {
       IP_ADAPTER_ADDRESSES *p = addresses;
       while (p != NULL) {
+        if (p->OperStatus == IfOperStatusUp) {
           // p->AdapterName appears to be a GUID.  Not sure if this is
           // actually useful to anyone; we'll store the "friendly name"
           // instead.
@@ -572,6 +573,7 @@ scan_interfaces() {
           }
 
           _interfaces.push_back(interface);
+        }
         p = p->Next;
       }
     }