GIO has this facility, so we should use it.
At the same time, make sure the immodules directory
exists, even if we don't install any modules there
outselves.
Add an extension point called gtk-im-module, which requires
the type GtkIMContext. Simplify the loading by using GIO
infrastructure. Drop the locale filtering for now, I don't
think it is really necessary nowadays.
Convert existing platform modules to gio modules.
Sill to do: Drop the conditional build machinery.
Either always include them, or never.
Before running gtk-query-immodules, the cache output directory may not
actually exist. Make sure it does before we try to write into it.
https://bugzilla.gnome.org/show_bug.cgi?id=793182
Signed-off-by: Daniel Stone <daniels@collabora.com>
When building GTK+ straight from the repository without any assistance
from packaging tools, we need to trigger system-wide updates, like the
icon theme cache update, or the schema compilation.
