PATCH for set/get environment variables

[Yung-Jang Lee]

Sylvestre ,

This is a patch to fix bug in set/get system environment variables,
please take a look to see if it need further modifications.

Yung-Jang Lee

--------------test script ------------------------
specialName='中文' ;// for CP950, BIG5
//specialName='æøå'; // for fr_FR with character code > 127
setenv('env',specialName)
getenv('env')==specialName
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