Fix generation of INSTALL file by removing link

Author: petere

doc/src/sgml/installation.sgml

@@ -1277,7 +1277,7 @@ su - postgres
         <para>
          Enable tests using the Perl TAP tools.  This requires a Perl
          installation and the Perl module <literal>IPC::Run</literal>.
-         See <xref linkend="regress-tap"> for more information.
+         <![%standalone-ignore;[See <xref linkend="regress-tap"> for more information.]]>
         </para>
        </listitem>
       </varlistentry>