bump base version for GHC 7.8.3
bump base version for GHC 7.8.3

erantapaa/haskell-platform,gbaz/haskell-platform,bgamari/haskell-platform,erantapaa/haskell-platform,ardumont/haskell-platform,gbaz/haskell-platform,thomie/haskell-platform,ardumont/haskell-platform,bgamari/haskell-platform,erantapaa/haskell-platform