mail: drop explicit mail import required by Python 2.4
He's dead, Jim.
--- a/mercurial/mail.py Mon May 18 16:33:57 2015 -0500
+++ b/mercurial/mail.py Mon May 18 16:46:32 2015 -0500
@@ -9,10 +9,6 @@
import util, encoding, sslutil
import os, smtplib, socket, quopri, time, sys
import email
-# On python2.4 you have to import these by name or they fail to
-# load. This was not a problem on Python 2.7.
-import email.Header
-import email.MIMEText
_oldheaderinit = email.Header.Header.__init__
def _unifiedheaderinit(self, *args, **kw):