[gcc r16-3070] libstdc++: Switch gcc.gnu.org installation docs to https

[Gerald Pfeifer]

https://gcc.gnu.org/g:b163ea73dcd06657e29d881f53bc8a95bc2658c5

commit r16-3070-gb163ea73dcd06657e29d881f53bc8a95bc2658c5
Author: Gerald Pfeifer <gerald@pfeifer.com>
Date:   Thu Aug 7 17:35:01 2025 +0200

    libstdc++: Switch gcc.gnu.org installation docs to https
    
    libstdc++-v3:
            * doc/xml/manual/build_hacking.xml: Switch gcc.gnu.org installation
            docs to https.
            * doc/html/manual/appendix_porting.html: Regenerate.

Diff:
---
 libstdc++-v3/doc/html/manual/appendix_porting.html | 2 +-
 libstdc++-v3/doc/xml/manual/build_hacking.xml      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/doc/html/manual/appendix_porting.html b/libstdc++-v3/doc/html/manual/appendix_porting.html
index 887fa50caa4c..7b63613a5513 100644
--- a/libstdc++-v3/doc/html/manual/appendix_porting.html
+++ b/libstdc++-v3/doc/html/manual/appendix_porting.html
@@ -26,7 +26,7 @@ Support for C++11 dialect.
 </a></span></dt><dt><span class="section"><a href="backwards.html#backwards.third.iterator_type">
   <code class="code">Container::iterator_type</code> is not necessarily <code class="code">Container::value_type*</code>
 </a></span></dt></dl></dd></dl></dd></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="appendix.porting.build_hacking"></a>Configure and Build Hacking</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="build_hacking.prereq"></a>Prerequisites</h3></div></div></div><p>
-    As noted <a class="link" href="http://gcc.gnu.org/install/prerequisites.html" target="_top">previously</a>,
+    As noted <a class="link" href="https://gcc.gnu.org/install/prerequisites.html" target="_top">previously</a>,
     certain other tools are necessary for hacking on files that
     control configure (<code class="code">configure.ac</code>,
     <code class="code">acinclude.m4</code>) and make
diff --git a/libstdc++-v3/doc/xml/manual/build_hacking.xml b/libstdc++-v3/doc/xml/manual/build_hacking.xml
index 20de49f553c0..4c044d97cab7 100644
--- a/libstdc++-v3/doc/xml/manual/build_hacking.xml
+++ b/libstdc++-v3/doc/xml/manual/build_hacking.xml
@@ -17,7 +17,7 @@
 <section xml:id="build_hacking.prereq"><info><title>Prerequisites</title></info>
 
   <para>
-    As noted <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://gcc.gnu.org/install/prerequisites.html">previously</link>,
+    As noted <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://gcc.gnu.org/install/prerequisites.html">previously</link>,
     certain other tools are necessary for hacking on files that
     control configure (<code>configure.ac</code>,
     <code>acinclude.m4</code>) and make