evas: remove EVAS_SLI code path, it was to slow and unused for years.

evas: remove EVAS_SLI code path, it was to slow and unused for years.

NOTE: other things that may join it in the near futur EVAS_FRAME_QUEUE,
EVAS_METRIC_CACHE and maybe EVAS_WORD_CACHE also. This is all part of
cleaning up our rendering path so we can actually improve it more easily.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/evas@70499 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33