Move end of {-# RULES #-} to be more forgiving for CPP

This fixes #105. Older GHC versions + clang ran into trouble, which this commit
fixes.

binary.cabal

 name:            binary
-version:         0.8.2.0
+version:         0.8.2.1
 license:         BSD3
 license-file:    LICENSE
 author:          Lennart Kolmodin <kolmodin@gmail.com>

changelog.md

 binary
 ======
 
+binary-0.8.2.1
+--------------
+
+- Fix compilation error when using older GHC versions and clang. clang barfs on some of its CPP input (#105).
+
 binary-0.8.2.0
 --------------
 

src/Data/Binary/Get/Internal.hs

@@ -398,9 +398,7 @@ readN !n f = ensureN n >> unsafeReadN n f
 {-# RULES
 
 "readN/readN merge" forall n m f g.
-  apG (readN n f) (readN m g) = readN (n+m) (\bs -> f bs $ g (B.unsafeDrop n bs))
-
- #-}
+  apG (readN n f) (readN m g) = readN (n+m) (\bs -> f bs $ g (B.unsafeDrop n bs)) #-}
 
 -- | Ensure that there are at least @n@ bytes available. If not, the
 -- computation will escape with 'Partial'.