Avoid linking to Qt5 DBus library on Windows and macOS

utils/appveyor/before_build.sh

@@ -10,7 +10,7 @@ export PATH=$PATH:$INSTALL_PREFIX/bin
 
 "$build" snoretoast "v$SNORETOAST_VERSION" "$SNORETOAST_BASE_URL"
 "$build" extra-cmake-modules
-"$build" kconfig "" "" "-DKCONFIG_USE_GUI=OFF"
+"$build" kconfig "" "" "-DKCONFIG_USE_GUI=OFF -DKCONFIG_USE_DBUS=OFF"
 "$build" kwindowsystem
 "$build" kcoreaddons
 "$build" knotifications

utils/github/homebrew/Formula/kf5-kconfig.rb

@@ -20,6 +20,7 @@ class Kf5Kconfig < Formula
     args << "-DKDE_INSTALL_QTPLUGINDIR=lib/qt5/plugins"
 
     args << "-DKCONFIG_USE_GUI=OFF"
+    args << "-DKCONFIG_USE_DBUS=OFF"
 
     mkdir "build" do
       system "cmake", "-G", "Ninja", "..", *args