gnu: gajim: Update to 1.2.2.

* gnu/packages/messaging.scm (gajim) [version]: Update to 1.2.2.
[arguments]<#:imported-modules>: New argument.
<#:modules>: New argument.
<#:phases>['wrap-gi-typelib-path]: Remove phase.
['install-icons]: Remove phase.
['wrap-gsettings-schema-dir]: Remove phase.
['check]: Modify phase.
['glib-or-gtk-compile-schemas]: New phase.
['glib-or-gtk-wrap]: New phase.
['wrap-env]: New phase.
[native-inputs]: Add gettext-minimal, glib:bin, gobject-introspection,
gtk+:bin, python-disutils-extra and  python-setuptools.  Remove intltool
and python-docutils.
[inputs]: Add avahi, dbus, farstream, geoclue, glib, glib-networking,
gsettings-desktop-schemas, gsound, gspell, gstreamer, gst-plugins-base,
gupnp-igd, libsoup, libxscrnsaver, network-manager, python-css-parser
and python-packaging.  Remove adwaita-icon-theme, gtkspell3, hicolor-icon-theme,
libsecret, python-cssutils, python-dbus, python-gnupg and python-qrcode.
[propagated-inputs]: Add dconf.

Signed-off-by: Julien Lepiller <julien@lepiller.eu>