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/cre2/default.nix

@@ -0,0 +1,34 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook,
+  libtool, pkg-config, re2, texinfo }:
+
+stdenv.mkDerivation rec {
+  pname = "cre2";
+  version = "0.3.6";
+
+  src = fetchFromGitHub {
+    owner = "marcomaggi";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1h9jwn6z8kjf4agla85b5xf7gfkdwncp0mfd8zwk98jkm8y2qx9q";
+  };
+
+  nativeBuildInputs = [
+    autoreconfHook
+    libtool
+    pkg-config
+  ];
+  buildInputs = [ re2 texinfo ];
+
+  NIX_LDFLAGS="-lre2 -lpthread";
+
+  configureFlags = [
+    "--enable-maintainer-mode"
+  ];
+
+  meta = with lib; {
+    homepage = "http://marcomaggi.github.io/docs/cre2.html";
+    description = "C Wrapper for RE2";
+    license = licenses.bsd3;
+    platforms = platforms.all;
+  };
+}