2to3: apply execfile fixer results.

The execfile command is gone in Python 3. The fix is to read the file,
then compile and exec the result.

setupegg.py

@@ -21,4 +21,4 @@
     setupfile = imp.load_source('setupfile', 'setup.py')
     setupfile.setup_package()
 else:
-    execfile('setup.py')
+    exec(compile(open('setup.py').read(), 'setup.py', 'exec'))