gdk-pixbuf: enable other loaders by default

gdk-pixbuf: enable other loaders by default

Refer [1], upstream gdk-pixbuf disable some loaders by default from
2.42.11, this makes some format of icons not works well after upgrade
gdk-pixbuf, report error like:
matchbox-deskto[501]: Error loading icon: Failed to load /usr/share/pixmaps/xinput_calibrator.xpm: Unrecognized image file format

Add PACKAGECONFIG gif, others, and fix the same as some other sdks and
arch linux, disable these loaders by default, refer [2][3][4]

[1] https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/e052a112075a19fb75f1f2ff3de4c82923de13f2
[2] https://gitlab.gnome.org/GNOME/gnome-build-meta/-/issues/846
[3] https://gitlab.com/freedesktop-sdk/freedesktop-sdk/-/commit/3ab7810255c64ce8aa2ae3ac10250148588ab49b
[4] https://gitlab.archlinux.org/archlinux/packaging/packages/gdk-pixbuf2/-/commit/4fa2d98a197781354b66a9710c9d596d502c961b

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>