Upgrades liboping to 1.8.0 and fixes perl compile error

Upgrades liboping to 1.8.0 (which includes fancy new graph modes).

Fixes a perl compile error along the way ("Only one of PREFIX or INSTALL_BASE can be given.  Not both."). 

I've disabled the bottle references in the Formula, as I have no idea how to build these, obviously :)
If you've set it I think maybe it's just worth unsetting rather than us handling it?