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/graphics/apngasm/2.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchzip, libpng, zlib, zopfli }:
+
+stdenv.mkDerivation rec {
+  pname = "apngasm";
+  version = "2.91";
+
+  src = fetchzip {
+    url = "mirror://sourceforge/${pname}/${pname}-${version}-src.zip";
+    stripRoot = false;
+    sha256 = "0qhljqql159xkn1l83vz0q8wvzr7rjz4jnhiy0zn36pgvacg0zn1";
+  };
+
+  buildInputs = [ libpng zlib zopfli ];
+
+  postPatch = ''
+    rm -rf libpng zlib zopfli
+  '';
+
+  NIX_CFLAGS_LINK = "-lzopfli";
+
+  installPhase = ''
+    install -Dt $out/bin apngasm
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    description = "Create highly optimized Animated PNG files from PNG/TGA images";
+    homepage = "http://apngasm.sourceforge.net/";
+    license = licenses.zlib;
+    maintainers = with maintainers; [ orivej ];
+    platforms = platforms.linux;
+  };
+
+}