[lwip-users] Change to port API: new call to lwip_socket_init() needed

[Jonathan Larmour]

As per patch #5468 (<https://savannah.nongnu.org/patch/?5468>), to save a 
little code space, and more importantly avoid a race condition, there must 
now be an explicit call in an lwIP port's startup code to a function:
 lwip_socket_init();
if you want to use the BSD socket-style API. It can be called anywhere 
after sys_init() but before any socket calls are made.

The prototype is available with a #include "lwip/sockets.h"

I've updated ports in the contrib module of CVS, but obviously it's more 
likely to affect people out there with their own ports. Remember to update 
your port if you are using CVS.

Jifl
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