Restore URL for Austern article on allocators

This reverts "Remove broken URL from libstdc++ manual" by restoring the
link, but using an archived copy from the Wayback Machine.

	* doc/xml/manual/allocator.xml: Use archived copy of CUJ article.
	* doc/html/*: Regenerate.

From-SVN: r276693

libstdc++-v3/ChangeLog

@@ -1,3 +1,8 @@
+2019-10-08  Jonathan Wakely  <jwakely@redhat.com>
+
+	* doc/xml/manual/allocator.xml: Use archived copy of CUJ article.
+	* doc/html/*: Regenerate.
+
 2019-10-06  François Dumont  <fdumont@gcc.gnu.org>
 
 	* include/bits/stl_algo.h

libstdc++-v3/doc/html/manual/memory.html

@@ -301,7 +301,9 @@
     </em>. </span>
       isoc++_1998
     <span class="pagenums">20.4 Memory. </span></p></div><div class="biblioentry"><a id="id-1.3.4.4.4.3.9.3"></a><p><span class="title"><em>
+      <a class="link" href="https://web.archive.org/web/20190622154249/http://www.drdobbs.com/the-standard-librarian-what-are-allocato/184403759" target="_top">
       The Standard Librarian: What Are Allocators Good For?
+      </a>
     </em>. </span><span class="author"><span class="firstname">Matt</span> <span class="surname">Austern</span>. </span><span class="publisher"><span class="publishername">
 	C/C++ Users Journal
       . </span></span><span class="pubdate">2000-12. </span></p></div><div class="biblioentry"><a id="id-1.3.4.4.4.3.9.4"></a><p><span class="title"><em>

libstdc++-v3/doc/xml/manual/allocator.xml

@@ -483,7 +483,10 @@
 
   <biblioentry>
     <title>
+      <link xmlns:xlink="http://www.w3.org/1999/xlink"
+	    xlink:href="https://web.archive.org/web/20190622154249/http://www.drdobbs.com/the-standard-librarian-what-are-allocato/184403759">
       The Standard Librarian: What Are Allocators Good For?
+      </link>
     </title>
 
     <author><personname><firstname>Matt</firstname><surname>Austern</surname></personname></author>