cogl-pipeline-fragend-arbfp: Generate ARBfp if user vertex shader
cogl-pipeline-fragend-arbfp: Generate ARBfp if user vertex shader

The ARBfp fragend was bypassing generating a shader if the pipeline
contains a user program. However it shouldn't do this if the pipeline
only contains a vertex shader. This was breaking
test-cogl-just-vertex-shader.

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