all-packages: Use callPackage where possible

pkgs/games/liquidwar/default.nix

@@ -1,11 +1,16 @@
-a :  
-let 
+a @ { xproto, libX11, libXrender
+, gmp, mesa, libjpeg, libpng
+, expat, gettext, perl
+, SDL, SDL_image, SDL_mixer, SDL_ttf
+, curl, sqlite
+, libogg, libvorbis, libcaca, csound, cunit, ... } :
+let
   buildInputs = with a; [
     xproto libX11 gmp guile
     mesa libjpeg libpng
     expat gettext perl
     SDL SDL_image SDL_mixer SDL_ttf
-    curl sqlite 
+    curl sqlite
     libogg libvorbis csound
     libXrender libcaca cunit
   ];
@@ -27,13 +32,13 @@ rec {
   setVars = a.noDepEntry (''
     export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I${a.SDL}/include/SDL"
   '');
-      
+
   meta = {
     description = "Quick tactics game";
     maintainers = [
       a.lib.maintainers.raskin
     ];
-    platforms = with a.lib.platforms; 
+    platforms = with a.lib.platforms;
       linux;
   homepage = "http://www.gnu.org/software/liquidwar6/";
   version = "0.6.3902";