RFR: JDK-8213906: Update arm devkits with libXrandr headers

[Tim Bell]

Erik:

> Please review this change which bumps the devkits Oracle uses to build
> Linux arm/aarch64 internally. I forgot to update them when adding
> libXrandr to the main Linux x64 devkit. No code changes required in the
> devkit generator makefiles.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8213906
>
> Webrev: http://cr.openjdk.java.net/~erikj/8213906/webrev.01/

Looks good.

Tim