uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/kde/khelpcenter.nix

@@ -0,0 +1,26 @@
+{ lib, mkDerivation
+, extra-cmake-modules, kdoctools
+, grantlee, kcmutils, kconfig, kcoreaddons, kdbusaddons, ki18n
+, kinit, khtml, kservice, xapian
+}:
+
+mkDerivation {
+  pname = "khelpcenter";
+  nativeBuildInputs = [ extra-cmake-modules kdoctools ];
+  buildInputs = [
+    grantlee kcmutils kconfig kcoreaddons kdbusaddons khtml
+    ki18n kinit kservice xapian
+  ];
+
+  preFixup = ''
+    qtWrapperArgs+=(
+      --prefix MANPATH : /nix/var/nix/profiles/system/sw/share/man
+    )
+  '';
+
+  meta = with lib; {
+    homepage = "https://apps.kde.org/help/";
+    description = "Help center";
+    license = licenses.gpl2Plus;
+  };
+}