CREDITS: remove some no-longer-active contributors that got added back. [skip ci]

To quote a comment from a 2003 commit that removed them the first time:

        removed people who shouldn't be bugged since they aren't
        actively committing code now.

Author: guyharris

CREDITS

@@ -38,7 +38,6 @@ Additional people who have contributed patches (in alphabetical order):
     Arkadiusz Miskiewicz          <misiek at pld dot org dot pl>
     Armando L. Caro Jr.           <acaro at mail dot eecis dot udel dot edu>
     Arnaldo Carvalho de Melo      <acme at ghostprotocols dot net>
-    Assar Westerlund              <assar at sics dot se>
     Atsushi Onoe                  <onoe at netbsd dot org>
     Baptiste Jonglez              <baptiste dot jonglez at ens-lyon dot org>
     Baruch Siach                  <baruch at tkos dot co dot il>
@@ -313,7 +312,6 @@ Additional people who have contributed patches (in alphabetical order):
     Tony Li                       <tli at procket dot com>
     Tony Samuels                  <vegizombie at gmail dot com>
     Tony Xu                       <hhktony at gmail dot com>
-    Torsten Landschoff            <torsten at debian dot org>
     Toshihiro Kanda               <candy at fct dot kgc dot co dot jp>
     Udayakumar                    <udaya011 at gmail dot com>
     Ulrich Windl                  <Ulrich dot Windl at RZ dot Uni-Regensburg dot DE>