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/libfann/default.nix

@@ -0,0 +1,25 @@
+{ stdenv, lib, fetchFromGitHub, cmake }:
+
+stdenv.mkDerivation rec {
+  pname = "libfann";
+  version = "2.2.0";
+
+  src = fetchFromGitHub {
+    owner = "libfann";
+    repo = "fann";
+    rev = version;
+    sha256 = "0awbs0vjsrdglqiaybb0ln13ciizmyrw9ahllahvgbq4nr0nvf6y";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  outputs = [ "out" "dev" ];
+
+  meta = {
+    homepage = "http://leenissen.dk/fann/wp/";
+    description = "Fast Artificial Neural Network Library";
+    maintainers = with lib.maintainers; [ fpletz ];
+    license = lib.licenses.lgpl21;
+    platforms = lib.platforms.all;
+  };
+}