cmake: Modified FindWeston.cmake to use libweston-layout.so
cmake: Modified FindWeston.cmake to use libweston-layout.so

libweston-layout.so is common layout library from ivi-shell of weston.
It supports common interface to control surfaces/layers.

Signed-off-by: Nobuhiko Tanibata <92313f26b3566e64b50391ce0051fc0e1f775402@denso.co.jp>

ntanibata/wayland-ivi-extension,ntanibata/wayland-ivi-extension