Allow propchange-email.pl to accept a diff file to put in the message instead of just a copy of the property value.  If the diff file is not supplied, it works as before.
Allow propchange-email.pl to accept a diff file to put in the message instead
of just a copy of the property value.  If the diff file is not supplied, it
works as before.

* tools/hook-scripts/propchange-email.pl.in
  Add a new option "-d diff_file" that specifies a file whose content is used
  instead of the property value.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@849290 13f79535-47bb-0310-9956-ffa450edef68

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