Only change the ownership of ${libdir}/gio/modules/giomodule.cache if
it exists.

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

update_gio_module_cache intercept creates file:
$D${libdir}/gio/modules/giomodule.cache

Change ownership of this file to root:root to avoid user contamination
by host.

Signed-off-by: Abdur Rehman <abdur_rehman@mentor.com>
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

The new class uses gio-querymodules tool on postinst and postrm.
This regenerates the module cache which is useful to avoid loading
modules that are not needed at runtime: If a Gio module is not
listed in the cache file it will always get loaded.

* Add a postinst-intercept 'gio-module-cache': it runs
  gio-querymodules using qemuwrapper. This is required because the tool
  actually loads the modules to generate the cache.
* Add a gio-module-cache class that adds postinstall and postrm
  scripts. In the sysroot population case use the new intercept.
* Inherit the new class in glib-2.0, glib-networking and gconf.

Fixes [YOCTO #9241].

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>