Add a shim for KSandbox

external/kcoreaddons/KSandbox

@@ -0,0 +1,23 @@
+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+namespace KSandbox {
+
+inline bool isInside() {
+    return false;
+}
+
+inline bool isFlatpak() {
+    return false;
+}
+
+inline bool isSnap() {
+    return false;
+}
+
+} // namespace KSandbox