[pango-display-list] Use indexed vertices on GLES
[pango-display-list] Use indexed vertices on GLES

Now that CoglVertexBuffers support indices we can use them with GLES
to avoid duplicating vertices. Regular GL still uses GL_QUADS because
it is shown to still have a performance benefit over indices with the
Intel drivers.

jigpu/clutter,djdeath/clutter-multithreaded,heysion/clutter-clone,djdeath/clutter,rkudiyarov/clutter_osx,heysion/clutter-clone,collects/clutter,djdeath/clutter-android,dlespiau/clutter,kerrickstaley/clutter-vala,tardyp/clutter,jigpu/clutter,nobled/clutter,spatulasnout/clutter,djdeath/clutter-multithreaded,kerrickstaley/clutter-vala,spatulasnout/clutter,jigpu/clutter,ebassi/clutter,GNOME/clutter,collects/clutter,djdeath/clutter,djdeath/clutter,rkudiyarov/clutter_osx,Distrotech/clutter,nobled/clutter,Distrotech/clutter,dlespiau/clutter,dlespiau/clutter,tardyp/clutter,spatulasnout/clutter,heysion/clutter-clone,GNOME/clutter,GNOME/clutter,GNOME/clutter,djdeath/clutter-multithreaded,spatulasnout/clutter,djdeath/clutter-android,kerrickstaley/clutter-vala,collects/clutter,ebassi/clutter,ebassi/clutter,djdeath/clutter,collects/clutter,djdeath/clutter-multithreaded,ebassi/clutter,djdeath/clutter,Distrotech/clutter,jigpu/clutter,heysion/clutter-clone,ebassi/clutter,Distrotech/clutter,rkudiyarov/clutter_osx,kerrickstaley/clutter-vala,Distrotech/clutter,tardyp/clutter,djdeath/clutter,GNOME/clutter,jigpu/clutter,spatulasnout/clutter,jigpu/clutter,djdeath/clutter-android,djdeath/clutter-android,rkudiyarov/clutter_osx,nobled/clutter,heysion/clutter-clone,djdeath/clutter-android,Distrotech/clutter,collects/clutter