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/opentoonz/source.nix

@@ -0,0 +1,16 @@
+# opentoonz's source archive contains both opentoonz's source and a modified
+# version of libtiff that opentoonz requires.
+
+{ fetchFromGitHub, }: rec {
+  versions = {
+    opentoonz = "1.5.0";
+    libtiff = "4.0.3";  # The version in thirdparty/tiff-*
+  };
+
+  src = fetchFromGitHub {
+    owner = "opentoonz";
+    repo = "opentoonz";
+    rev = "v${versions.opentoonz}";
+    sha256 = "1rw30ksw3zjph1cwxkfvqj0330v8wd4333gn0fdf3cln1w0549lk";
+  };
+}