Use cogl_texture_multiple_rectangles in CoglPangoRenderer
Use cogl_texture_multiple_rectangles in CoglPangoRenderer

The glyphs are queued into an array of rectangles instead of being
drawn directly. Whenever a different texture is used or the sequence
is complete the array is flushed.

This is based on a patch from Owen Taylor.

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