Removes GHC.Word8.eqWord8 import for 7.10.3

Removes import of GHC.Word.eqWord8 from BenchIndices,
as GHC.Word does not export eqWord8 in GHC 7.10.3.

Reimplements nilEq in terms of (==)

bench/BenchIndices.hs

@@ -15,7 +15,7 @@ import           Data.Monoid
 import           Data.String
 import           Gauge
 import           Prelude                               hiding (words)
-import           GHC.Word                              (Word8, eqWord8)
+import           Data.Word                             (Word8)
 
 import qualified Data.ByteString                       as S
 import qualified Data.ByteString.Unsafe                as S
@@ -99,7 +99,7 @@ bench_find_index_second bs =
 {-# INLINE bench_find_index_second #-}
 
 bench_elem_index_second :: S.ByteString -> Maybe Int
-bench_elem_index_second bs = 
+bench_elem_index_second bs =
   let nl = 0xa
    in case S.elemIndex nl bs of
         Just !i -> S.elemIndex nl (S.unsafeDrop (i+1) bs)
@@ -116,7 +116,7 @@ bench_elem_indices_second = safeHead . tail . bench_elem_indices
 
 nilEq :: Word8 -> Word8 -> Bool
 {-# NOINLINE nilEq #-}
-nilEq = eqWord8
+nilEq = (==)
 
 bench_find_indices_inline :: S.ByteString -> [Int]
 bench_find_indices_inline = S.findIndices (== 0xa)
@@ -132,4 +132,4 @@ bench_find_indices_noinline = S.findIndices (nilEq 0xa)
 
 bench_find_index_noinline :: S.ByteString -> Maybe Int
 bench_find_index_noinline = S.findIndex (nilEq 0xa)
-{-# INLINE bench_find_index_noinline #-}
+{-# INLINE bench_find_index_noinline #-}