#65 unicode/tchar fixes

[Mattia Barbon]

stdio.h,wchar.h
* the first argument of wswscanf must be const

tchar.h
* #defines for _tfopen, _tgetenv, _tsetlocale

[Mattia Barbon]

[Earnie Boyd]

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Your patch has been accepted and is now commited to CVS. You should expect to see it in the next release.