wcmd: Fix redirecting a pipe to another pipe

[Erich Hoover]

Real Name:
   Erich Hoover
Description:
   Fix a problem with Wine's cmd.exe that causes redirecting a pipe to
another pipe to fail.  Can be tested by executing 'echo "test" 2>&1'
in cmd.exe.  Without the patch the redirect will fail, with the patch
the redirect is properly handled by existing code.
Changelog:
   wcmd: Fix redirecting a pipe to another pipe
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