RFR: JDK-8065183: Add --with-copyright-year option to configure

[Tim Bell]

Hi Erik:

> Please review this small change, adding a configure option for 
> changing the COPYRIGHT_YEAR value.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8065183
> Webrev: http://cr.openjdk.java.net/~erikj/8065183/webrev.root.01/
>
> The same patch applies cleanly to jdk8u, except for 
> generated-configure of course, and I would like to backport this to 8u.

Looks good to me.

/Tim