[bug#48554] GTK v4

[Raghav Gururajan]

Hello Guix,

I am opening this thread for gtk v4 packaging.

GTK project changed the name from gtk+ gtk for v4. The versions are 
still referred to as gtk+. Therefore, we don't have to append '4' to the 
variable and package name. This package definition of gtk (v4) will not 
interfere with the use gtk+ (v3) and/or gtk+-2 (v2).

This path-series are to be tried or used, on top of wip-gnome, along 
with #48459.

Currently I am facing issues with tests. Help are welcome.

:)

Regards,
RG.

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