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

[Erik Joelsson]

Hello,

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/

/Erik