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/libyaml/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv
+, fetchFromGitHub
+, autoreconfHook
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libyaml";
+  version = "0.2.5";
+
+  src = fetchFromGitHub {
+    owner = "yaml";
+    repo = "libyaml";
+    rev = version;
+    sha256 = "18zsnsxc53pans4a01cs4401a2cjk3qi098hi440pj4zijifgcsb";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+
+  meta = with lib; {
+    homepage = "https://pyyaml.org/";
+    description = "A YAML 1.1 parser and emitter written in C";
+    license = licenses.mit;
+    platforms = platforms.all;
+  };
+}