RFR (S): 8080087: Nashorn $ENV.PWD is originally undefined

[Michael Haupt]

Dear all,

please review and sponsor this fix.
Bug: https://bugs.openjdk.java.net/browse/JDK-8080087
Webrev: http://cr.openjdk.java.net/~mhaupt/8080087/webrev.00

In Nashorn scripting mode, $ENV.PWD contains the current working directory. This is imported from the environment on unixy platforms. As the PWD variable is nonexistent on Windows by default, it needs to be set explicitly.

Thanks,

Michael

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