RFR (XS): 8080286: use path separator setting consistently in Nashorn project properties

[Michael Haupt]

Hi,

please review and sponsor this fix:
Webrev: http://cr.openjdk.java.net/~mhaupt/8080286/webrev.00
Bug: https://bugs.openjdk.java.net/browse/JDK-8080286

A problem with this on Windows is that, at least with a very recent ant version (1.9.4), TestNG classes cannot properly be imported into JavaScript because the class path setting is not recognised. Using a platform-independent abstraction for the path separator in the project properties fixes this.

Best,

Michael

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