ICOM G3: rewrite with CUdpSocket::Open(uiPort, af = AF_INET)

For a while, this code is needed to surpress unwanted UDP port listening.
If ICOM will implement G3 on IPv6, this should be reverted.

src/cg3protocol.cpp

@@ -59,14 +59,14 @@ bool CG3Protocol::Init(void)
     m_ReflectorCallsign.PatchCallsign(0, (const uint8 *)"XLX", 3);
 
     // create our DV socket
-    ok &= m_Socket.Open(G3_DV_PORT);
+    ok &= m_Socket.Open(G3_DV_PORT, AF_INET);
     if ( !ok )
     {
         std::cout << "Error opening socket on port UDP" << G3_DV_PORT << " on ip " << g_Reflector.GetListenIp() << std::endl;
     }
 
     //create helper sockets
-    ok &= m_PresenceSocket.Open(G3_PRESENCE_PORT);
+    ok &= m_PresenceSocket.Open(G3_PRESENCE_PORT, AF_INET);
     if ( !ok )
     {
         std::cout << "Error opening socket on port UDP" << G3_PRESENCE_PORT << " on ip " << g_Reflector.GetListenIp() << std::endl;

src/cudpmsgsocket.cpp

@@ -38,7 +38,7 @@ bool CUdpMsgSocket::Open(uint16 uiPort)
     struct sockaddr_storage *ss;
     socklen_t ss_len;
     
-    if ( !CUdpSocket::Open(uiPort) )
+    if ( !CUdpSocket::Open(uiPort, AF_INET) )
     {
         return false;
     }