RFR: 8329471: Remove GTK2

[Abhishek Kumar]

On Mon, 29 Jul 2024 14:55:07 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

> GTK2 support for Swing/AWT was deprecated for removal in JDK 21. 
> 
> It's being removed because no platform that supports the JDK needs it.
> 
> Manual and automated testing is green.

Other references related to gtk2 here

1. [DesktopGtkLoadTest](https://github.com/openjdk/jdk/blob/574358df3b4891e953f84814c64ac651ea37755a/test/jdk/java/awt/Desktop/DesktopGtkLoadTest/DesktopGtkLoadTest.java#L56)
2. [DemandGTK3.sh](https://github.com/openjdk/jdk/blob/574358df3b4891e953f84814c64ac651ea37755a/test/jdk/javax/swing/LookAndFeel/8145547/DemandGTK3.sh#L28)

BugId and copyright year also can be updated.

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PR Comment: https://git.openjdk.org/jdk/pull/20378#issuecomment-2257688464