Remove link to ODBCng project from the docs.

Thom Browne pointed out that the URL was out of date, and Devrim GÜNDÜZ
pointed out that the project isn't maintained anymore.

doc/src/sgml/external-projects.sgml

@@ -102,13 +102,6 @@
       <entry><ulink url="http://npgsql.projects.postgresql.org/">http://npgsql.projects.postgresql.org/</ulink></entry>
      </row>
 
-     <row>
-      <entry>ODBCng</entry>
-      <entry>ODBC</entry>
-      <entry>An alternative ODBC driver</entry>
-      <entry><ulink url="http://projects.commandprompt.com/public/odbcng/">http://projects.commandprompt.com/public/odbcng/</ulink></entry>
-     </row>
-
      <row>
       <entry>pgtclng</entry>
       <entry>Tcl</entry>
@@ -119,7 +112,7 @@
      <row>
       <entry>psqlODBC</entry>
       <entry>ODBC</entry>
-      <entry>The most commonly-used ODBC driver</entry>
+      <entry>ODBC driver</entry>
       <entry><ulink url="http://psqlodbc.projects.postgresql.org/">http://psqlodbc.projects.postgresql.org/</ulink></entry>
      </row>