Misc. fixes for the rpi backend

[Kristian Høgsberg]

On Thu, Oct 24, 2013 at 03:38:28PM +0200, Tomeu Vizoso wrote:
> Except for the first one, all are intended to fix the RPi backend after
> the landing of the views work.
> 
> Most EGL clients won't work yet because of wl_buffer.release events being
> always queued, though.

Thanks for fixing it up, all applied.

Kristian