msvcrt: fix ungetc behavior

[Paul Rupe]

MSDN says that ungetc is ignored when called with EOF.  Wine was incorrectly 
pushing a -1 back into the data stream.  This patch ignores EOF and adds a 
test case.  Proxomitron now works with builtin msvcrt.

Changelog:
  Paul Rupe <prupe at myrealbox.com>
  make ungetc(EOF) a no-op


-- 
Paul Rupe   <prupe at myrealbox.com>
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