Drop GTK2 support in favor of GTK3

[Thorsten Behrens]

Caolán McNamara wrote:
> https://gerrit.libreoffice.org/#/c/77405/ is my proposal to drop
> LibreOffice's Gtk2 support in favor of the Gtk3 vclplug for LibreOffice
> 6.4.
>
About time, yep. I just wonder if we should give it the usual
one-release-cycle deprecation warning?

Cheers,

-- Thorsten
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