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/libr3/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv
+, fetchFromGitHub
+, pcre
+, pkg-config
+, check
+, autoreconfHook
+}:
+
+stdenv.mkDerivation rec {
+  pname = "r3";
+  version = "1.3.4";
+
+  src = fetchFromGitHub {
+    owner = "c9s";
+    repo = "r3";
+    rev = version;
+    sha256 = "09cixbms817p6nb77wz3rxp0znnac8ybycvsrrzgwlbfn58a3zwl";
+  };
+
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
+
+  buildInputs = [ check ];
+  propagatedBuildInputs = [ pcre ];
+
+  strictDeps = true;
+
+  meta = {
+    description = "A high-performance path dispatching library";
+    homepage = "https://github.com/c9s/r3";
+    license = [ lib.licenses.mit ];
+  };
+
+}