GNU runtime doesn't tolerate sending messages to metaclass objects

[GoogleCodeExporter]

We currently import meta-class objects to Haskell land when a class method 
sends a message to super.
This causes at least a lookup of the __getHaskellData__ method and a call to 
retain. On Mac OS X, this seems to cause no problems, but the GNU runtime 
aborts with an assertion failure.

The call to retain was introduced by enhancement issue #11 (r380, r399, 
merged to trunk in r402), but the __getHaskellData__ lookup was there 
before.

Original issue reported on code.google.com by [email protected] on 20 Aug 2009 at 9:52