[wwwdocs,Fortran] Links to source code for the Stephen Chapman books

[Gerald Pfeifer]

We carry these two links in readings.html, however they now redirect
to a generic page of the institution.

Does any of you have a better reference (Google did not give me one
easily)?  

Otherwise I plan on applying the patch below.

Thanks,
Gerald

Index: readings.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/readings.html,v
retrieving revision 1.281
diff -u -r1.281 readings.html
--- readings.html	9 Sep 2017 14:01:28 -0000	1.281
+++ readings.html	29 Oct 2017 15:06:31 -0000
@@ -486,16 +486,6 @@
            <a href="http://www.fortran.com/F/books.html">Examples</a> of
            <cite>Essential Fortran 90 & 95</cite> by Loren Meissner.
          </li>
-         <li>
-           <a href="http://www.mhhe.com/engcs/general/chapman/intro/">Source
-           code</a> of <cite>Introduction To Fortran 90/95</cite> by Stephen
-           Chapman.
-         </li>
-         <li>
-           <a href="http://www.mhhe.com/engcs/general/chapman/">Source
-           code</a> of <cite>Fortran 90/95 for Scientists and Engineers</cite>
-           by Stephen Chapman.
-         </li>
        </ul>
      </li>
    </ul>