Remove distribute dependency.

Distribute has been merged with upstream setuptools. The two are
incompatible now, so MySQL-python is uninstallable on systems
with setuptools >= 0.7 installed.

setup.py

@@ -3,8 +3,6 @@
 import os
 import sys
 
-from distribute_setup import use_setuptools
-use_setuptools()
 from setuptools import setup, Extension
 
 if not hasattr(sys, "hexversion") or sys.hexversion < 0x02040000: