[Open-graphics] Problems building S3 and xp10

[Kenneth Ostby]

Kenneth Ostby:
>However, I'm having problems building both the XP10 and the S3 toplevel.
>When I run iverilog on them Xp10 complains about not finding:
>	EHXPLLB referenced 4 times.
>	OLVDS referenced 2 times.
>	divider referenced 4 times.

I added the EHXPLLB and OLVDS primitives to the SVN repo now. They
don't quite confirm to the manual, but at least they're a starting
point for further hacking ( And having them there allows us to build
from iverilog ). 

-- 
Life on the earth might be expensive, but it 
includes an annual free trip around the sun.

Kenneth Østby
http://langly.org