pipeline: remove duplicate defines
pipeline: remove duplicate defines

There was a spurious duplication of the COGL_PIPELINE_VERTEND_DEFAULT
and COGL_PIPELINE_VERTEND_UNDEFINED defines which this patch removes.

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

gcampax/cogl,djdeath/cogl-android,djdeath/cogl,djdeath/cogl-android,djdeath/cogl,djdeath/cogl,djdeath/cogl-android,gcampax/cogl,gcampax/cogl,gcampax/cogl