RFR: 8299595: Remove terminally deprecated JavaFX GTK 2 library [v2]

[Thiago Milczarek Sayao]

On Wed, 18 Jan 2023 00:04:22 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:
> 
>   Pre-review adjustments

This is with SWT 3.8.2 (uses gtk2):

![image](https://user-images.githubusercontent.com/30704286/214099291-01afcbe0-5bf3-4ca6-b428-c8d8d5f76a2e.png)

With SWT 4.26:

![image](https://user-images.githubusercontent.com/30704286/214100052-f5891a3c-86b7-4cbd-8490-2166100cc0ec.png)

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