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/libemf2svg/default.nix

@@ -0,0 +1,31 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, fontconfig
+, freetype
+, libpng
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libemf2svg";
+  version = "1.1.0";
+
+  src = fetchFromGitHub {
+    owner = "kakwa";
+    repo = pname;
+    rev = version;
+    sha256 = "04g6dp5xadszqjyjl162x26mfhhwinia65hbkl3mv70bs4an9898";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ fontconfig freetype libpng ];
+
+  meta = with lib; {
+    description = "Microsoft EMF to SVG conversion library";
+    homepage = "https://github.com/kakwa/libemf2svg";
+    maintainers = with maintainers; [ erdnaxe ];
+    license = licenses.gpl2Only;
+    platforms = [ "x86_64-linux" ];
+  };
+}