License-Update: gdk-pixbuf: Fix LICENSE.
As README.md says gdk-pixbuf is under not only LGPLv2.1 but also its
later version, I fixed LICENSE value.
Signed-off-by: Akira Shibakawa <arabishi900@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>