Fixed up most warnings after bacdcode changes to unsigned and signed decoding.

Fixed up the Visual C++ demo in ports/win32/bacnet/

bacnet-stack/ports/win32/bip-init.c

@@ -85,6 +85,12 @@ static void cleanup(void)
   WSACleanup();
 }
 
+void bip_set_interface(char *ifname)
+{
+  (void)ifname;
+  /* dummy function */
+}
+
 bool bip_init(void)
 {
     int rv = 0; // return from socket lib calls