Add critbit patch for foldl' change

patches/critbit-0.2.0.0.patch

 diff --git a/Data/CritBit/Set.hs b/Data/CritBit/Set.hs
-index 0039925..4a4ffc4 100644
+index 0039925..0bfc74d 100644
 --- a/Data/CritBit/Set.hs
 +++ b/Data/CritBit/Set.hs
-@@ -90,6 +90,7 @@ import Data.CritBit.Types.Internal (CritBit(..), Set(..), CritBitKey, Node(..))
+@@ -90,16 +90,20 @@ import Data.CritBit.Types.Internal (CritBit(..), Set(..), CritBitKey, Node(..))
  import Data.Foldable (Foldable, foldMap)
  import Data.Maybe (isJust)
  import Data.Monoid (Monoid(..))
+-import Prelude hiding (null, filter, map, foldl, foldr)
 +import Data.Semigroup (Semigroup(..))
- import Prelude hiding (null, filter, map, foldl, foldr)
++import Prelude hiding (null, filter, map, foldl, foldr, foldl')
  import qualified Data.CritBit.Tree as T
  import qualified Data.List as List
-@@ -97,9 +98,12 @@ import qualified Data.List as List
+ 
  instance (Show a) => Show (Set a) where
      show s = "fromList " ++ show (toList s)
  
@@ -25,7 +26,7 @@ index 0039925..4a4ffc4 100644
  
  instance Foldable Set where
 diff --git a/Data/CritBit/Tree.hs b/Data/CritBit/Tree.hs
-index e50738b..5eb95fa 100644
+index e50738b..7c1b205 100644
 --- a/Data/CritBit/Tree.hs
 +++ b/Data/CritBit/Tree.hs
 @@ -153,15 +153,19 @@ import Data.CritBit.Core
@@ -34,7 +35,8 @@ index e50738b..5eb95fa 100644
  import Data.Monoid (Monoid(..))
 +import Data.Semigroup (Semigroup(..))
  import Data.Traversable (Traversable(traverse))
- import Prelude hiding (foldl, foldr, lookup, null, map, filter)
+-import Prelude hiding (foldl, foldr, lookup, null, map, filter)
++import Prelude hiding (foldl, foldr, lookup, null, map, filter, foldl')
  import qualified Data.Array as A
  import qualified Data.Foldable as Foldable
  import qualified Data.List as List