bug: unsetenv should return int, not void

[Sam Steingold]

http://www.opengroup.org/onlinepubs/009695399/functions/unsetenv.html
#include <stdlib.h>
int unsetenv(const char *name);
-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
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In C you can make mistakes, while in C++ you can also inherit them!

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