Upgrade to Wayland/Weston 1.9.0

Yocto 2.0 ("Jethro") provides Wayland and Weston 1.8.0;
manually upgrading to 1.9.0 does not break compatibility
with existing frameworks (Qt..), while at the same time
allowing easier integration of mandatory components such
as Weston IVI-Shell and Wayland IVI Extension.

We can thus in the same pass remove backport patches for
these 2 components.

Here is the related discussion on the mailing list :

http://lists.linuxfoundation.org/pipermail/
automotive-discussions/2016-March/001623.html

Change-Id: I874eac50ff64d8b93e32910b6f1297002faa06a5
Signed-off-by: Manuel Bachmann <mbc@iot.bzh>