Make sure that OpenVPN relays can not be selected on Android

mullvad-relay-selector/src/relay_selector/matcher.rs

@@ -113,11 +113,13 @@ pub const fn filter_openvpn(relay: &Relay) -> bool {
     matches!(relay.endpoint_data, RelayEndpointData::Openvpn)
 }
 
-/// Returns whether the relay is a Wireguard relay.
+/// Returns whether the relay matches the tunnel constraint `filter`
 pub const fn filter_tunnel_type(filter: &Constraint<TunnelType>, relay: &Relay) -> bool {
     match filter {
         Constraint::Any => true,
         Constraint::Only(typ) => match typ {
+            // Do not keep OpenVPN relays on Android
+            TunnelType::OpenVpn if cfg!(target_os = "android") => false,
             TunnelType::OpenVpn => filter_openvpn(relay),
             TunnelType::Wireguard => filter_wireguard(relay),
         },