RFR: JDK-8233381 Update copyright year in build system files

[Erik Joelsson]

Looks good.

/Erik

On 2019-11-01 03:33, Magnus Ihse Bursie wrote:
> I noticed that the copyright year was not properly updated to 2019 in 
> multiple make files that was indeed modified in 2019.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8233381
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8233381-update-copyright-year-2019/webrev.01
>
> /Magnus