ark: add patch "missing QVector include"

pkgs/applications/kde/ark/default.nix

@@ -1,5 +1,5 @@
 {
-  mkDerivation, lib, config,
+  mkDerivation, lib, config, fetchpatch,
 
   extra-cmake-modules, kdoctools,
 
@@ -27,6 +27,14 @@ mkDerivation {
     maintainers = [ lib.maintainers.ttuegel ];
   };
 
+  patches = [
+    # This patch should be backported in 19.04.4 KDE applications
+    (fetchpatch {
+      url = "https://cgit.kde.org/ark.git/patch/?id=7065c5390c78c2b18807721490f19c62761220e5";
+      sha256 = "0sipw5z60gk6l025rk4xsbc10n3bvv9743f4cbvf6hyy4mbm4p1m";
+    })
+  ];
+
   outputs = [ "out" "dev" ];
   nativeBuildInputs = [ extra-cmake-modules kdoctools ];
   buildInputs = [ libarchive libzip ] ++ extraTools;