RFR: 8299595: Remove terminally deprecated JavaFX GTK 2 library [v7]

[Glavo]

On Tue, 21 Feb 2023 00:29:13 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> Simple PR to remove gtk2 library compilation and loading.
>
> Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve exception

I think there is a noteworthy situation: JFoenix's smooth scrolling does not work when using GTK3 and will prevent scrolling up through the mouse wheel. After removing GTK2, some programs that use JFoenix cannot work properly.

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PR: https://git.openjdk.org/jfx/pull/999