Checked in without testing since I don't have Windows running at the moment.  The changes to winreg.c were made to _winreg.c since that file was renamed.

Accepted & assigned back to Trent.

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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()

*** Ignore the last comment, that is not what this patch does at all. Rather: ***

Fix PC/msvcrtmodule.c and PC/winreg.c for Win64. Basically:

- sizeof(HKEY) > sizeof(long) on Win64, so use PyLong_FromVoidPtr() instead of
  PyInt_FromLong() to return HKEY values on Win64

- Check for string overflow of an arbitrary registry value (I know that
  ensuring that a registry value does not overflow 2**31 characters seems
  ridiculous but it is *possible*).