RFR: JDK-8220093: Change to GCC 8.2 for building on Linux at Oracle

[Tim Bell]

Erik:

> In addition to this, the devkit generator makefiles are getting some
> touchups. The ccache build output is moved to the correct location.
> Fixed an issue with creating tar files. Changed binutils to use gold by
> default. Also fixed the linker version check in configure to be
> compatible with gold.
>
> Webrev: http://cr.openjdk.java.net/~erikj/8220093/webrev.01
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8220093

Looks good.

Tim