RFR 8187965: dynalink samples under $jdk10/src/sample/nashorn/dynalink are broken

[Sundararajan Athijegannathan]

Please review.

Bug: https://bugs.openjdk.java.net/browse/JDK-8187965

Webrev: http://cr.openjdk.java.net/~sundar/8187965/webrev.00/

Dynalink samples are broken because of wildcard usage in jar command.

PS. Piggybacking another sample script base64.js

Thanks,
-Sundar