Delete obsolete .IX macro from man pages

man/dkimsign.1

@@ -127,24 +127,20 @@
 .rm #[ #] #H #V #F C
 .\" ========================================================================
 .\"
-.IX Title "dkimsign 1"
 .TH dkimsign 1 "2018-02-05"
 .SH "NAME"
 dkimsign
 \-
 Script for DKIM signing messages on stdin
 .SH "VERSION"
-.IX Header "VERSION"
 0\.7\.0
 
 .SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
 
 dkimsign is a filter that reads an RFC822 message on standard input, and writes
 the same message on standard output with a DKIM-Signature line prepended.  
 
 .SH "USAGE"
-.IX Header "USAGE"
 
 usage: dkimsign.py [\-h] [\-\-hcanon {simple,relaxed}]
                    [\-\-bcanon {simple,relaxed}]
@@ -168,7 +164,6 @@ optional arguments:
   \-\-identity IDENTITY   Optional value for i= tag.
 
 .SH "AUTHORS"
-.IX Header "AUTHORS"
 The original version of \fBdkimsign\fR was written by Greg Hewgill
 <greg@hewgill.com>.  It has been substantially rewritten by Scott Kitterman
 <scott@kitterman.com>.