* gnu/packages/patches/glade-gls-set-script-name.patch: New patch.
* gnu/packages/patches/glade-test-widget-null-icon.patch: New patch.
* gnu/local.mk (DIST_PATCH_DATA): Add them.
* gnu/packages/gnome.scm (glade3): Update to 3.38.2.
[source]: Apply the patches.
[arguments]: Add new skip-gtk-update-icon-cache and fix-tests phases.
Adapt the fix-docbook phase to the meson build system.
[native-inputs]: Add glib, python-pyobject, gobject-introspection and
gjs. Remove python 2.
