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/tools/misc/envchain/default.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, libedit, libsecret, ncurses, pkg-config, readline, Security }:
+
+stdenv.mkDerivation rec {
+  pname = "envchain";
+  version = "1.0.1";
+
+  src = fetchFromGitHub {
+    owner = "sorah";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0qxwiqhb8cg0zbn5p0mvnbyxx1xwvgiricrkjlvxz13sf2ngq87p";
+  };
+
+  postPatch = ''
+    sed -i -e "s|-ltermcap|-lncurses|" Makefile
+  '';
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ libsecret readline ]
+    ++ lib.optionals stdenv.isDarwin [ libedit ncurses Security ];
+
+  makeFlags = [ "DESTDIR=$(out)" ];
+
+  meta = with lib; {
+    description = "Set environment variables with macOS keychain or D-Bus secret service";
+    homepage = "https://github.com/sorah/envchain";
+    license = licenses.mit;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ bbigras ];
+  };
+}