Use common licence attributes from lib/licenses.nix

Many (less easily automatically converted) old-style strings
remain.

Where there was any possible ambiguity about the exact version or
variant intended, nothing was changed. IANAL, nor a search robot.

Use `with stdenv.lib` wherever it makes sense.

pkgs/games/warsow/default.nix

@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
     cur_rpath=$(patchelf --print-rpath $p)
     patchelf --set-rpath $cur_rpath:${mesa}/lib $p
   '';
-  meta = {
+  meta = with stdenv.lib; {
     description = "Multiplayer FPS game designed for competitive gaming";
     longDescription = ''
       Set in a futuristic cartoon-like world where rocketlauncher-wielding
@@ -56,8 +56,8 @@ stdenv.mkDerivation rec {
     '';
     homepage = http://www.warsow.net;
     # Engine is under GPLv2, everything else is under
-    license = [ "unfree-redistributable" ];
-    maintainers = with stdenv.lib.maintainers; [ astsmtl ];
-    platforms = with stdenv.lib.platforms; linux;
+    license = with licenses; unfreeRedistributable;
+    maintainers = with maintainers; [ astsmtl ];
+    platforms = with platforms; linux;
   };
 }