Use `Environment' to simplify and fix a compilation error.
The file was missing the proper include for `getenv'. Instead of adding the include, I used the `Environment' functions. There's still a lot of #if _WIN32 ... #else in here though, which might be able to be unified now. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@6907 18c085ea-50e0-402c-830e-de6fd14e8384
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