Shared JCC object on Linux requires setuptools patch

The current method to build JCC as a shared object on Linux requires patching the setuptools package. Here's a patch to JCC that monkey-patches the setuptools Library and Extension classes to avoid the manual patch. It works with setuptools-0.6c7-11 and distribute-0.6.1+ without the need of manually patching setuptools. These are the same versions that the current manual patches work with: patch.43.0.6c7 works with setuptools-0.6c7-10 and distribute-0.6.1+ while patch.43.0.6.c11 works with setuptools-0.6c11.