* gnu/packages/gnome.scm (gnome-shell): Update to 42.4.
[source](patches): Remove.
[arguments]: Adjust substitution to disable GTK icon cache. Filter disallowed
references from GUIX_PYTHONPATH. While at it, also prevent MESON from ending
up in the closure.
[inputs]: Change from LIBGWEATHER to LIBGWEATHER4.
* gnu/packages/patches/gnome-shell-polkit-autocleanup.patch:
* gnu/local.mk (dist_patch_DATA):