New review comment by paper42 on void-packages repository

https://github.com/void-linux/void-packages/pull/36311#discussion_r895060416

Comment:
> > why is gtk4-devel required in $hostmakedepends?
> 
> When building the documentation: `ERROR: Could not find GIR dependency in the search paths: Gtk-4.0` `gtk4-devel` also helps pull in `gtk-update-icon-cache`. If you want me to change it so that it uses gtk-update-icon-cache always and gtk4-devel or something else when it is building the docs, feel free to let me know.

makes sense