RFR(S): 8144221: fix Nashorn shebang argument handling on Mac/Linux

[Michael Haupt]

Dear all,

please review this change.
Bug: https://bugs.openjdk.java.net/browse/JDK-8144221
Webrev: http://cr.openjdk.java.net/~mhaupt/8144221/webrev.00

The fix for Cygwin is pending and tracked by JDK-8145305.

Thanks,

Michael

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Dr. Michael Haupt | Principal Member of Technical Staff
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