[OE-core] Wayland/Weston initial patches

[Alex DAMIAN]

These three patches enable wayland and weston building on top of 
mesa-dri and X.

Weston runs normally with the X11 backend, and have KMS mode setting
on real hardware (kernel 3.0 on Intel 2nd Generation Core).

Please review these patches and let me know if you see improvements.

I'll resubmit together with kernel changes when I have a stable 
version for running directly on hardware.