RFR: JDK-8297332: Remove easy warnings in javafx.base

[Nir Lisker]

On Mon, 21 Nov 2022 22:28:15 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> treating certain categories of warnings as errors at compilation time is quite feasible. The JDK does this.

I have "missing override annotations" set to errors in my projects. I think it's a good candidate here.

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PR: https://git.openjdk.org/jfx/pull/957