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/libspng/default.nix

@@ -0,0 +1,57 @@
+{ lib
+, fetchFromGitHub
+, stdenv
+, zlib
+, ninja
+, meson
+, pkg-config
+, cmake
+, libpng
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libspng";
+  version = "0.7.2";
+
+  src = fetchFromGitHub {
+    owner = "randy408";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-GgrTWC/cesDlEh2J6StCyKiLRk62xfy2+E4lnmJMLGs=";
+  };
+
+  doCheck = true;
+
+  mesonBuildType = "release";
+
+  mesonFlags = [
+    # this is required to enable testing
+    # https://github.com/randy408/libspng/blob/bc383951e9a6e04dbc0766f6737e873e0eedb40b/tests/README.md#testing
+    "-Ddev_build=true"
+  ];
+
+  outputs = [ "out" "dev" ];
+
+  checkInputs = [
+    cmake
+    libpng
+  ];
+
+  buildInputs = [
+    pkg-config
+    zlib
+  ];
+
+  nativeBuildInputs = [
+    ninja
+    meson
+  ];
+
+  meta = with lib; {
+    description = "Simple, modern libpng alternative";
+    homepage = "https://libspng.org/";
+    license = with licenses; [ bsd2 ];
+    maintainers = with maintainers; [ humancalico ];
+    platforms = platforms.all;
+  };
+}