WININET: implement InternetTime{From,To}SystemTime{A,W} (#3)

[Hans Leidekker]

This version has the proper A->W crosscalls as suggested by Alexandre,
includes the extra tests from Dmitry and makes them pass.

 -Hans

Changelog:
  Implement and test InternetTime{From,To}SystemTime{A,W}.
  Correct spelling in InternetCheckConnectionA.
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