near finished yet). Add working OpenGL for XCB engine.
NB: wrt Opengl...Raster, this is the env var/dlsym version you
requested this morning ;)
NB: Basically what happens is, if you know you do not ever want/use
opengl, you can export ECORE_X_NO_XLIB env variable, and ecore_x will
use pure xcb to establish it's X connection. However, if you do use
OpenGL and this env var is not exported, then ecore_x(cb) will use
XOpenDisplay to init the connection.
SVN revision: 61724
37b122117e