Python 3 preparation: remove obsolete email module monkey patch.

This monkey patch has a comment saying it's obsolete with a minimum
Python version of 2.7.  Furthermore, it does not work with Python 3,
both because the email.Header name has gone away (only email.header
remains) and because the __dict__ object is a mappingproxy in Python 3
which can't be modified in the way used there.  So the monkey patch is
removed in this patch.

Author: jsm28

roundup/anypy/email_.py

@@ -4,18 +4,6 @@
 from email import quoprimime, base64mime
 
 ## please import this file if you are using the email module
-#
-# a "monkey patch" to unify the behaviour of python 2.5 2.6 2.7
-# when generating header files, see http://bugs.python.org/issue1974
-# and https://hg.python.org/cpython/rev/5deb27042e5a/
-# can go away once the minimum requirement is python 2.7
-_oldheaderinit = email.Header.Header.__init__
-def _unifiedheaderinit(self, *args, **kw):
-    # override continuation_ws
-    kw['continuation_ws'] = ' '
-    _oldheaderinit(self, *args, **kw)
-email.Header.Header.__dict__['__init__'] = _unifiedheaderinit
-##
 
 # Match encoded-word strings in the form =?charset?q?Hello_World?=
 ecre = re.compile(r'''