fix socket module for 64-bits (mostly Win64) about cpython HOT 5 CLOSED

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Checked in verbatim.

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Accepted and assigned back to Trent.
I'm starting to hate Win64 <wink>.

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This patch fixes possible overflows in the socket module for 64-bit platforms
(mainly Win64). The changes are:

• abstract the socket type to SOCKET_T (this is SOCKET on Windows, int on
  Un*x), this is necessary because sizeof(SOCKET) > sizeof(int) on Win64
• use INVALID_SOCKET on Win32/64 for an error return value for accept()
• ensure no overflow of the socket variable for: (1) a PyObject return value
  (use PyLong_FromLongLong if necessary); and (2) printf formatting in repr()

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