Add cross-reference for test permutations in libstdc++ manual

	* doc/xml/manual/appendix_contributing.xml: Link to test docs and
	note higher DejaGnu version requirement.
	* doc/html/*: Regenerate.

From-SVN: r248092

libstdc++-v3/ChangeLog

 2017-05-16  Jonathan Wakely  <jwakely@redhat.com>
 
+	* doc/xml/manual/appendix_contributing.xml: Link to test docs and
+	note higher DejaGnu version requirement.
+	* doc/html/*: Regenerate.
+
 	* doc/xml/manual/appendix_contributing.xml: Link to the list of bad
 	identifiers.
 	* doc/html/*: Regenerate.

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

@@ -70,7 +70,9 @@ It has subdirectories:
     library.  Support for "make check" and "make check-install" is
     complete, and runs through all the subdirectories here when this
     command is issued from the build directory.  Please note that
-    "make check" requires DejaGNU 1.4 or later to be installed.
+    "make check" requires DejaGnu 1.4 or later to be installed,
+    or for extra <a class="link" href="test.html#test.run.permutations" title="Permutations">permutations</a>
+    DejaGnu 1.5.3 or later.
     </dd></dl></div><p>
 Other subdirectories contain variant versions of certain files
 that are meant to be copied or linked by the configure script.

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

@@ -358,7 +358,9 @@ It has subdirectories:
     library.  Support for "make check" and "make check-install" is
     complete, and runs through all the subdirectories here when this
     command is issued from the build directory.  Please note that
-    "make check" requires DejaGNU 1.4 or later to be installed.
+    "make check" requires DejaGnu 1.4 or later to be installed,
+    or for extra <link linkend="test.run.permutations">permutations</link>
+    DejaGnu 1.5.3 or later.
     </listitem>
   </varlistentry>
 </variablelist>