[aur-general] AUR cleanup package list

[Hugo Doria]

kernel26thinkpad could be removed. I moved him to the to "packages to
remove" list.

I added a comment to mplayer-w32codecs package. It would be better if
we could rename it to "codecs-extra" as suggested before.

openarena could be kept since some servers still runs the older version.

I also moved some other packages.

-- 
Hugo Doria
http://hdoria.archlinux-br.org