ok - longstanding issue. quality of jpeg encode and decode dropped

ok - longstanding issue. quality of jpeg encode and decode dropped
quickly when uf your-encoded anything due to using IFAST decoder (and
encoder). this does drop speed for decode and encode (except encoding
< 60% quality where it now uses IFAST), but we don't see progressively
worse artifacts.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/eet@65294 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33