Add patches for bifunctors and fgl

Changes due to ghc@d87f28d8

patches/fgl-5.8.0.0.patch

+diff --git a/Data/Graph/Inductive/PatriciaTree.hs b/Data/Graph/Inductive/PatriciaTree.hs
+index 20c9dae..cc44ef2 100644
+--- a/Data/Graph/Inductive/PatriciaTree.hs
++++ b/Data/Graph/Inductive/PatriciaTree.hs
+@@ -1,6 +1,7 @@
+ {-# LANGUAGE BangPatterns, CPP, ScopedTypeVariables #-}
+ #if __GLASGOW_HASKELL__ >= 702
+ {-# LANGUAGE DeriveGeneric #-}
++{-# LANGUAGE DeriveFunctor #-}
+ #endif
+ 
+ -- |An efficient implementation of 'Data.Graph.Inductive.Graph.Graph'
+@@ -60,7 +61,7 @@ import Control.Arrow (second)
+ 
+ newtype Gr a b = Gr (GraphRep a b)
+ #if __GLASGOW_HASKELL__ >= 702
+-  deriving (Generic)
++  deriving (Generic, Functor)
+ #endif
+ 
+ type GraphRep a b = IntMap (Context' a b)
+diff --git a/Data/Graph/Inductive/Tree.hs b/Data/Graph/Inductive/Tree.hs
+index f8f9087..88e275e 100644
+--- a/Data/Graph/Inductive/Tree.hs
++++ b/Data/Graph/Inductive/Tree.hs
+@@ -1,6 +1,7 @@
+ {-# LANGUAGE CPP #-}
+ #if __GLASGOW_HASKELL__ >= 702
+ {-# LANGUAGE DeriveGeneric #-}
++{-# LANGUAGE DeriveFunctor #-}
+ #endif
+ 
+ -- (c) 1999 - 2002 by Martin Erwig [see file COPYRIGHT]
+@@ -39,7 +40,7 @@ import Control.Arrow (first, second)
+ 
+ newtype Gr a b = Gr (GraphRep a b)
+ #if __GLASGOW_HASKELL__ >= 702
+-  deriving (Generic)
++  deriving (Generic, Functor)
+ #endif
+ 
+ type GraphRep a b = Map Node (Context' a b)