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/development/libraries/qxmpp/default.nix

@@ -0,0 +1,46 @@
+{ mkDerivation
+, lib
+, fetchFromGitHub
+, cmake
+, pkg-config
+, withGstreamer ? true
+, gst_all_1
+}:
+
+mkDerivation rec {
+  pname = "qxmpp";
+  version = "1.4.0";
+
+  src = fetchFromGitHub {
+    owner = "qxmpp-project";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1knpq1jkwk0lxdwczbmzf7qrjvlxba9yr40nbq9s5nqkcx6q1c3i";
+  };
+
+  nativeBuildInputs = [
+    cmake
+  ] ++ lib.optionals withGstreamer [
+    pkg-config
+  ];
+  buildInputs = lib.optionals withGstreamer (with gst_all_1; [
+    gstreamer
+    gst-plugins-bad
+    gst-plugins-base
+    gst-plugins-good
+  ]);
+  cmakeFlags = [
+    "-DBUILD_EXAMPLES=false"
+    "-DBUILD_TESTS=false"
+  ] ++ lib.optionals withGstreamer [
+    "-DWITH_GSTREAMER=ON"
+  ];
+
+  meta = with lib; {
+    description = "Cross-platform C++ XMPP client and server library";
+    homepage = "https://github.com/qxmpp-project/qxmpp";
+    license = licenses.lgpl21Plus;
+    maintainers = with maintainers; [ astro ];
+    platforms = with platforms; linux;
+  };
+}