WESTON BUG

[microcai]

When weston compisotor lanches, it is using launching  EGL platform,
aka, DRM or X11

But the fellow clients shout then use  Wayland EGL platform.

The problem is that shell-desktop.so and tablet-desktop.so  runs
inside weston, thus it is using  the launching EGL platform, DRM or
X11, that's wrong.

weston itself shout let the EGL choose platform, DRM or X11, but
explicitly use Wayland platform in client code.