Merge pull request #1014 from miccoli/issue-436

addresses #436: Updating MANIFEST.in does not correctly update the package sdist creates

setuptools/command/egg_info.py

@@ -564,8 +564,6 @@ class manifest_maker(sdist):
         rcfiles = list(walk_revctrl())
         if rcfiles:
             self.filelist.extend(rcfiles)
-        elif os.path.exists(self.manifest):
-            self.read_manifest()
         ei_cmd = self.get_finalized_command('egg_info')
         self.filelist.graft(ei_cmd.egg_info)