Adapt to work with GHC 6.12

- Adapted the package to work with GHC 6.12
- Plugins that depend on the old base3 are currently
  not correctly loaded as the plugin loaded misses
  the dependence on syb (leading to unresolved symbols)
- Cleaned up most of the testsuite (there are still
  some outstanding failures, of which only one
  demonstrates a bug in the plugins library as far
  as I can see — see previous bullet point)
- Cleaned out a little cruft (but more could be done)

testsuite/objc/expression_parser/PluginEvalAux.hs

@@ -15,7 +15,7 @@ symbol = "resource"
 
 evalWithStringResult :: FilePath -> String -> IO String
 evalWithStringResult srcFile s = do
-  status <- make srcFile ["-Onot"]
+  status <- make srcFile ["-O0"]
   case status of
       MakeFailure err   -> putStrLn "error occured" >> return (show err)
       MakeSuccess _ obj -> load' obj