RFR: 8274107: Cherry pick GTK WebKit 2.32.4 changes

[Kevin Rushforth]

On Thu, 23 Sep 2021 19:26:47 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

> Cherry pick the GTK webkit 2.32.4 changes
> https://webkitgtk.org/2021/09/17/webkitgtk2.32.4-released.html

Looks good. I built and tested it on all platforms.

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.java.net/jfx/pull/631