gobject-introspection: update to 1.48.0

Add a patch that reverts an incomplete upstream attempt at cross-compile support;
upstream has been notified:
https://bugzilla.gnome.org/show_bug.cgi?id=696773



Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>