Unbreak accelerate for GHC 7.6.3

Before this change, it'd fail with

Data/Array/Accelerate/Array/Sugar.hs:668:4:
     error: invalid preprocessing directive
      #-}
       ^
Merge pull request #103 from audreyt/patch-1

Unbreak accelerate for clang
fix fusion for 2-array consumers

such as segmented reduction as used by smvm ):