libgles-omap3: Remove X11 related build and packaging

The SGX530 driver for X11 is only buildable and testable standalone
with the pre-built X11 package provided with the Graphics SDK.
This patch removes X11 build from the default recipe, to enable
moving X11 build to a separate recipe.

This is part of a clean up of the Graphics recipe starting from
4.09.00.01 version of the Graphics SDK.

Signed-off-by: Prabindh Sundareson <prabu@ti.com>