[wwwdocs] readings.html link maintenance

[Gerald Pfeifer]

On Wed, 8 Feb 2017, Rainer Orth wrote:
>> -  <li><a href="http://www.tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51_HTML/SUPPDOCS/OBJSPEC/TITLE.HTM">
>> -  Information on the Digital UNIX/Compaq Tru64 UNIX object file format</a></li>
>> -</ul><ul>
> while the HTML link on
> http://h41361.www4.hpe.com/docs/pub_page/V51B_DOCS/v51b_doclist.htm is
> dangling, the PDF link there is still valid.

Ah, thanks!

Tru64 UNIX V5.1 was deprecated with 4.7.  Is there any version
of Tru64 a current release of GCC still supports?  In particular
if we have support in trunk, I'd restore the bit above with the
new link.

Gerald