Replace broken link to custom local gettext package with one to the main

GNU site for gettext.

doc/src/sgml/installation.sgml

@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.325.2.1 2009/12/07 19:20:01 mha Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.325.2.2 2009/12/08 19:22:49 mha Exp $ -->
 
 <chapter id="installation">
  <title><![%standalone-include[<productname>PostgreSQL</>]]>
@@ -252,7 +252,7 @@ su - postgres
       class="osname">Linux</>, <systemitem class="osname">NetBSD</>,
       <systemitem class="osname">Solaris</>), for other systems you
       can download an add-on package from <ulink
-      url="http://developer.postgresql.org/~petere/bsd-gettext/"></ulink>.
+      url="http://www.gnu.org/software/gettext/"></ulink>.
       If you are using the <application>Gettext</> implementation in
       the <acronym>GNU</acronym> C library then you will additionally
       need the <productname>GNU Gettext</productname> package for some