Remove code for r_equalize_entities*.

Remove code for r_equalize_entities*.

r_fullbright_directed and slapping EF_FULLBRIGHT on these entities works a lot
better. I believe other than Xonotic nobody uses this, and Xonotic used it only
to make some fullbright stuff prettier and that's been removed for a few months
now.

After this change, older Xonotic versions will complain about nonexisting flag
at startup, but I bet no player will even notice the difference - all it changes
is that EF_FULLBRIGHT entities will appear less directionally, and
r_fullbright_directed 1 will fix this in a better way (already set in current
Xonotic).

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12474 d7cf8633-e32d-0410-b094-e92efae38249