Add `uninstall :pkgutil` to squirrel

`:delete` key necessary, preserved.
Add `uninstall :pkgutil` to gambit-c
Add `uninstall :pkgutil` to mailfollowup
Add `uninstall :pkgutil` to authbuddy

`:delete` key redundant, removed.
Add `uninstall :pkgutil` to virtualbox
Add `uninstall :pkgutil` to vagrant
Add `uninstall :pkgutil` to totalfinder
Add `uninstall :pkgutil` to haskell-platform
Add `uninstall :pkgutil` to whatpulse

`:delete` key redundant, removed.
Add `uninstall :pkgutil` to totalterminal