Adjust to type change of TupE in Template Haskell 2.16.

diff --git a/src/Ganeti/THH/Types.hs b/src/Ganeti/THH/Types.hs
--- a/src/Ganeti/THH/Types.hs
+++ b/src/Ganeti/THH/Types.hs
@@ -123,4 +123,11 @@ curryN n = do
   f <- newName "f"
   ps <- replicateM n (newName "x")
   return $ LamE (VarP f : map VarP ps)
-             (AppE (VarE f) (TupE $ map VarE ps))
+             (AppE (VarE f) (nonUnaryTupE $ map VarE ps))
+  where
+    nonUnaryTupE :: [Exp] -> Exp
+    nonUnaryTupE es = TupE $
+#if MIN_VERSION_template_haskell(2,16,0)
+                            map Just
+#endif
+                            es