RFR(S): 8149744: fix testng.jar delivery in Nashorn build.xml

[Michael Haupt]

Dear all,

please review this fix.
Bug: https://bugs.openjdk.java.net/browse/JDK-8149744
Webrev: http://cr.openjdk.java.net/~mhaupt/8149744/webrev.00/

Nashorn's build.xml used to download a TestNG ZIP file and extract the required testng.jar from that. The URL of the ZIP file is no longer valid. The change addresses this by having build.xml download the four required JAR files (TestNG and dependencies).

Thanks,

Michael

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