Backport a patch from upstream to fix skipped tests, essential for gdk-pixbuf to
pass without enabling all loaders.
(From OE-Core rev: 4bf996557409b63c2d783f175c6325c966aae236)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>