clipper2: use lib.platforms.all

While there might actually be broken platforms, there is no reason
to limit supported platforms to just Linux systems.

pkgs/by-name/cl/clipper2/package.nix

@@ -40,6 +40,6 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/AngusJohnson/Clipper2";
     license = lib.licenses.boost;
     maintainers = [ lib.maintainers.cadkin ];
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.all;
   };
 }