[libstdc++,doc] doc/xml/manual/policy_data_structures_biblio.xml - pubs.opengroup.org goes https

[Gerald Pfeifer]

Committed.

2019-10-25  Gerald Pfeifer  <gerald@pfeifer.com>
 
	* doc/xml/manual/policy_data_structures_biblio.xml: Switch
	pubs.opengroup.org to https.

Index: doc/xml/manual/policy_data_structures_biblio.xml
===================================================================
--- doc/xml/manual/policy_data_structures_biblio.xml	(revision 277435)
+++ doc/xml/manual/policy_data_structures_biblio.xml	(working copy)
@@ -1232,7 +1232,7 @@
     <biblioentry xml:id="biblio.select_man">
       <title>
 	<link xmlns:xlink="http://www.w3.org/1999/xlink"
-	      xlink:href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/select.html">
+	      xlink:href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/select.html">
 	  select
 	</link>
       </title>