RFR 8193779: Fix copyright header in nashorn builtin scripts

[Alan Bateman]

On 19/12/2017 10:38, Sundararajan Athijegannathan wrote:
> Please review.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8193799
> Webrev: http://cr.openjdk.java.net/~sundar/8193799/webrev.00/
Looks fine. Will you push this to jdk/jdk10?

-Alan