plasma5Packages.kdesu: restrict platforms

pkgs/development/libraries/kde-frameworks/kdesu/default.nix

@@ -1,5 +1,5 @@
 {
-  mkDerivation,
+  mkDerivation, lib,
   extra-cmake-modules,
   kcoreaddons, ki18n, kpty, kservice, qtbase,
 }:
@@ -11,4 +11,5 @@ mkDerivation {
   propagatedBuildInputs = [ kpty ];
   outputs = [ "out" "dev" ];
   patches = [ ./kdesu-search-for-wrapped-daemon-first.patch ];
+  meta.platforms = lib.platforms.linux ++ lib.platforms.freebsd;
 }