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/tools/graphics/pngoptimizer/default.nix

@@ -0,0 +1,34 @@
+{ lib, stdenv, fetchFromGitHub, gtk3, pkg-config }:
+
+stdenv.mkDerivation rec {
+  pname = "pngoptimizer";
+  version = "2.7";
+
+  src = fetchFromGitHub {
+    owner = "hadrien-psydk";
+    repo = "pngoptimizer";
+    rev = "v${version}";
+    sha256 = "1hbgf91vzx46grslfdx86smdvm6gs6lq9hpa3bax9xfbsknxi0i7";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ gtk3 ];
+
+  makeFlags = [ "CONFIG=release" "DESTDIR=$(out)" ];
+
+  postInstall = ''
+    mv $out/usr/bin $out/bin
+    mv $out/usr/share $out/share
+    rmdir $out/usr
+  '';
+
+  meta = with lib; {
+    homepage = "https://psydk.org/pngoptimizer";
+    description = "PNG optimizer and converter";
+    # https://github.com/hadrien-psydk/pngoptimizer#license-information
+    license = with licenses; [ gpl2Only lgpl21Only zlib ];
+    maintainers = with maintainers; [ smitop ];
+    platforms = with platforms; linux;
+  };
+}