spans: remove unused intersect_start/end_local members
spans: remove unused intersect_start/end_local members

There were simply two unused members in CoglSpanIter which this patch
removes.

Reviewed-by: Neil Roberts <822ec91a7ef82248fd36162ca8ac3283eba70848@linux.intel.com>

Distrotech/cogl,djdeath/cogl-android,gcampax/cogl,djdeath/cogl-android,collects/cogl,djdeath/cogl-android,gcampax/cogl,Distrotech/cogl,gcampax/cogl,gcampax/cogl,collects/cogl,djdeath/cogl,Distrotech/cogl,djdeath/cogl,Distrotech/cogl,djdeath/cogl