virtual/openvg virtual/gles virtual/egl
I'd like to introduce those virtual so far mesa[gallium] provides
openvg-1.0, gles-2.0, gles-1.0 and egl-1.4 and binaries from companies
are going to provide more or less the same features.
Caveat: openvg and gles are bound to the egl implementation so you
cannot mix and match them.
Caveat2: I'm checking what happens with the xcb move since it should be
compatible but it could not.