Move the Winsock initialization and cleanup to wsutil routines.

Those routines exist on both Windows and UN*X, but they don't do
anything on UN*X (they could if it were ever necessary).

That eliminates some #ifdefs, and also means that the gory details of
initializing Winsock, including the Winsock version being requested,
are buried in one routine.

The initialization routine returns NULL on success and a pointer to a
g_malloc()ated error message on failure; report the error to the user,
along with a "report this to the Wireshark developers" suggestion.

That means including wsutil/socket.h, which obviates the need to include
some headers for socket APIs, as it includes them for you.

Change-Id: I9327bbf25effbb441e4217edc5354a4d5ab07186
Reviewed-on: https://code.wireshark.org/review/33045
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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