RFR: 8259864: Cleanup unused Prism files

Sat Jan 16 21:25:33 UTC 2021

On Sat, 16 Jan 2021 18:35:42 GMT, Johan Vos <jvos at openjdk.org> wrote:

> Fix for JDK-8259864
> Remove java and native files that are not used/maintained in prism configurations.

There are references to `eglx11` and `eglfb` in some of the `buildSrc/*.gradle` files. I recommend cleaning those up, too.

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PR: https://git.openjdk.java.net/jfx/pull/378