pipeline: remove dubious optimization
pipeline: remove dubious optimization

This removes an optimization that I added at some point, which I'm
pretty certain I only added on a hunch. Reading the description I'm not
really convinced it makes sense to do this given that the fixed vertend
and fragend are currently listed before the glsl vertend and fragend in
the order that we look for a suitable backend. This means unless the
pipeline depends on glsl (e.g. due to an associated snippet) we would
reselect the fixed backend anyway, and if it really did depend on glsl
then we'd notice when we come to flush and switch backends there any way.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 071698d2c017af33e41b838429d514f5df5e02a1)

Distrotech/cogl,Distrotech/cogl,Distrotech/cogl,Distrotech/cogl