evas gl: Remove single-line pipe code of gl commands.

evas gl: Remove single-line pipe code of gl commands.

Summary:
GLPIPES is proved to use since it's been used for many years as the default.
On the other hand, single-line routine hans't, acutally it's not maintained properly.
Even this single-line routine doesn't compileable right moment.

This patch is one refactoring to clean up code that's not valuable to maintain.

Reviewers: #committers, raster, cedric, ManMower

Reviewed By: #committers, ManMower

Subscribers: ManMower, cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D7328

Change-Id: Id80ee877544e02959f4606a3c8180637d8c72137