mswsock:Implement 3 functions by calling through SIO_GET_EXTENSION_FUNCTION_POINTER (try 3)

[Jon Griffiths]

Andrey,

Good comments, thanks! I've changed the function ptrs to use typedefs and made the GUID's local to the call site as per your suggestions. File level statics are initialised to 0 by the compiler, so we don't need to set them to anything if 0 is what we want.

If you spot anything else, let me know.

Cheers
Jon


      
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