wscript: Correctly use CommandLineToArgvW.

[Thomas Faber]

Fixes use of the wrong error path when no arguments are present
(i.e. cmdline is an empty string):
./wine wscript
fixme:wscript:wWinMain Could not find engine for L".exe"

now:
./wine wscript
fixme:wscript:wWinMain No file name specified

See http://blogs.msdn.com/b/oldnewthing/archive/2010/09/16/10062818.aspx
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