A simple but substantial change: uIP used the htons()/HTONS() macro

functions for converting between host and network byte order. These
names are the de facto standard names for this functionality because
of the original BSD TCP/IP implementation. But they cause problems for
uIP/Contiki: some platforms define these names themselves (Mac OS,
most notably), causing compilation problems for Contiki on those
platforms.

This commit changes all htons to uip_htons instead. Same goes for
htonl, ntohs, and ntohl. All-caps versions as well.

doc/example-program.c

@@ -46,7 +46,7 @@ PROCESS_THREAD(example_program_process, ev, data)
    * attach any special data to the connection, so we pass it a NULL
    * parameter.
    */
-  c = udp_broadcast_new(HTONS(4321), NULL);
+  c = udp_broadcast_new(UIP_HTONS(4321), NULL);
   
   /*
    * Loop for ever.