Fix a minor mailer.py Subject: line bug.
Fix a minor mailer.py Subject: line bug.

* tools/hook-scripts/mailer/mailer.py
  (get_commondir): Don't destructive pop() the first dirlist item.
    That's ... lossy.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@854912 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion