wayland: Fix installation patch issue

wayland: Fix installation patch issue

This patch modify the way we manage wayland path issues.
Instead of patching each recipe to make it work with wayland and its protocols,
it is better to patch wayland to fix its path issues.

So wayland-scanner.pc, wayland-client.pc and wayland-protocols.pc are patched to change paths.

Then we can drop the following workaround:

WAYLAND_PROTOCOLS_SYSROOT_DIR=${RECIPE_SYSROOT}

in:

- gtk+3
- libsdl2
- xserver-xorg
- gstreamer1.0-plugins-bad
- weston-2.0.0

We also dropped libsdl2 patches which fix wayland paths.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.co.uk>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>