WSCEnumProtocols

[Hans Leidekker]

Here's a reworked patch that doesn't try to cleverly handle arrays of
WSAPROTOCOL_INFOA and W structures within the same function. Instead it
duplicates some code in separate handlers for A and W. 

So I'm still being lazy because a proper AW conversion would rid us of
the code duplication but at least it's correct now, as shown by the
tests I added.

 -Hans

Changelog:
  fill WSAPROTOCOL_INFO structures instead of PROTOCOL_INFO structures.
  implement WSCEnumProtocols().
  add some tests.
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