Fix preprocessor directives for GHC 7.6.3

Fails to compile and install on GHC 7.6.3 (bottled from homebrew, on osx 10.8.5)

Complains about wrong preprocessor directive

```
Control/Exception/Lifted.hs:7:4:
     error: invalid preprocessing directive
      #-}
       ^
```

and

```
Control/Concurrent/MVar/Lifted.hs:6:4:
     error: invalid preprocessing directive
      #-}
       ^
```