Drop GTK2 support in favor of GTK3

[Thorsten Behrens]

Rene Engelhard wrote:
> https://wiki.documentfoundation.org/ReleaseNotes/6.2 already has
> 
> The GTK+2 VCL backend is deprecated and will be removed in a future
> version."
> 
Ah - didn't check in older release notes; taking the caveat back
then. ;)

Cheers,

-- Thorsten
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