wcmd: Properly cleanup redirects when there are no in/out/error pipes

[Erich Hoover]

Real Name:
   Erich Hoover
Description:
   Fix a problem with Wine's cmd.exe that causes the file handles for
redirects to not be cleaned up when the in/out/error pipes do not exist
(when GetStdHandle(pipe) == INVALID_HANDLE_VALUE).  This issue was uncovered
getting Athena Visual Studio to work, it spawns off a copy of cmd.exe to run
a batch file and that process does not have any pipes.
Changelog:
   wcmd: Properly cleanup redirects when there are no in/out/error pipes
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