RFR: 8289384: Fix warnings: method does not override the inherited method since it is private to a different package

[Andy Goryachev]

On Wed, 13 Jul 2022 07:35:06 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> Instead, use `@Override` always, and make it an error if it is missing. These compiler warning settings are more than likely just a left over from the days before `@Override` existed.

right, however @Override is not missing in the case of BaseShaderGraphics.  I'd rather fix both warnings.

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PR: https://git.openjdk.org/jfx/pull/824