Fixed 3 buffer overflows when fetching env. vars in wcmdmain.c

[Alexander.Farber at nokia.com]

Hello,

I've tried to fix these 2 issues in programs/cmd/wcmdmain.c:

1) The return value of GetEnvironmentVariable() is DWORD 
   and not BOOL or int

2) There are 3 checks like status > sizeof(...)
   I think that status >= sizeof(...) should be used instead

Changelog: 
	cmd: Fixed 3 buffer overflows

Regards
Alex

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