[libstdc++] Update URLs

[Phil Edwards]

I got burned a while back because the list of autotools versions was
outdated in one place.  Instead of listing the versions, let's just link
to one of the other N-1 places which lists them.  Also, some other link
updates and clarifications.


2004-08-04  Phil Edwards  <phil@codesourcery.com>

	* docs/html/configopts.html:  Emphasize that options change.
	* docs/html/17_intro/configury.html:  Update links.


Index: docs/html/configopts.html
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/docs/html/configopts.html,v
retrieving revision 1.36
diff -u -p -r1.36 configopts.html
--- docs/html/configopts.html	27 Jun 2004 20:48:44 -0000	1.36
+++ docs/html/configopts.html	4 Aug 2004 14:39:40 -0000
@@ -35,8 +35,9 @@ options</a></h1>
    <!-- This SECnn should be the "Choosing Package Options" section. -->
    <a href="http://www.gnu.org/software/autoconf/manual/autoconf-2.57/html_node/autoconf_131.html#SEC131">they
    all have opposite forms as well</a>
-   (enable/disable and with/without).  The defaults are for current
-   development sources.
+   (enable/disable and with/without).  The defaults are for <strong>current
+   development sources</strong>, which may be different than those for
+   released versions.
 </p>
 <p>The canonical way to find out the configure options that are
    available for a given set of libstdc++ sources is to go to the
Index: docs/html/17_intro/configury.html
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/docs/html/17_intro/configury.html,v
retrieving revision 1.4
diff -u -p -r1.4 configury.html
--- docs/html/17_intro/configury.html	10 Dec 2003 00:05:31 -0000	1.4
+++ docs/html/17_intro/configury.html	4 Aug 2004 14:39:40 -0000
@@ -30,7 +30,7 @@ Canadian cross build.</code></p>
 <blockquote>
 No problem is insoluble in all conceivable circumstances.<br />
 -- The Cosmic AC,
-<a href="http://people.inf.elte.hu/simi/szovegek/Asimov1.html">The
+<a href="http://mit.edu/tylerc/www/twt/LQ1.htm">The
 Last Question</a>, by Isaac Asimov
 </blockquote>
 <ul>
@@ -48,9 +48,11 @@ Last Question</a>, by Isaac Asimov
   alt="Dependency graph in PNG graphics format.  (Get a better browser!)" /></p>
 
 <p>Regenerate using a command sequence like
-   <code>"aclocal-1.7 && autoconf2.50 && autoheader2.50
+   <code>"aclocal-1.7 && autoconf-2.59 && autoheader-2.59
    && automake-1.7"</code> as needed.  And/or configure with
-   --enable-maintainer-mode.
+   --enable-maintainer-mode.  The version numbers will vary depending on
+   <a href="http://gcc.gnu.org/install/prerequisites.html">the current
+   requirements</a> and your vendor's choice of installation names.
 </p>
 
 
@@ -247,7 +249,8 @@ Last Question</a>, by Isaac Asimov
      <p>If you're wondering what that line noise in the last example was,
      that's how you embed autoconf special characters in output text.
      They're called
-<a href="http://www.gnu.org/manual/autoconf/html_node/autoconf_95.html#SEC95"><em>quadrigraphs</em></a>
+<a
+href="http://www.gnu.org/software/autoconf/manual/autoconf-2.57/html_node/autoconf_95.html#SEC95"><em>quadrigraphs</em></a>
      and you should use them whenever necessary.</p></li>
  <li><p>HELP-STRING is what you think it is.  Do not include the "default"
      text like we used to do; it will be done for you by GLIBCXX_ENABLE.