Remove comment that references a setup command, but even at the time it was...

Remove comment that references a setup command, but even at the time it was committed, it's not duplicate code from anything in setuptools, and I'm unaware of what a setup command is.

setuptools/command/easy_install.py

@@ -238,7 +238,6 @@ class easy_install(Command):
             self.config_vars['usersite'] = self.install_usersite
 
         # fix the install_dir if "--user" was used
-        # XXX: duplicate of the code in the setup command
         if self.user and site.ENABLE_USER_SITE:
             self.create_home_path()
             if self.install_userbase is None: