Patches to cabal files

Hello,

I had a hard time finding the source for the opengl bindings because the
locations mentioned in the .cabals were no longer valid.  In particular,
http://www.haskell.org/HOpenGL/ is a 404.

Eventually I stumbled on the wiki page, so I changed the above URL to
http://www.haskell.org/haskellwiki/Opengl and added a link to the darcs repo
in each cabal file.  Also, 'cabal sdist' gave a few warnings and one error
so I fixed those as well.

I've attached patches for all these changes.  Please let me know if you have
any questions or concerns.

Thanks,
Jason

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