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/gensio/default.nix

@@ -0,0 +1,40 @@
+{ autoreconfHook
+, fetchFromGitHub
+, lib
+, nix-update-script
+, pkg-config
+, stdenv
+}:
+
+stdenv.mkDerivation rec {
+  pname = "gensio";
+  version = "2.3.7";
+
+  src = fetchFromGitHub {
+    owner = "cminyard";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-g1o/udsIFLJ+gunvI2QtsnksPaa946jWKkcdmdGmQ/k=";
+  };
+
+  passthru = {
+    updateScript = nix-update-script {
+      attrPath = pname;
+    };
+  };
+
+  configureFlags = [
+    "--with-python=no"
+  ];
+
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
+
+  meta = with lib; {
+    description = "General Stream I/O";
+    homepage = "https://sourceforge.net/projects/ser2net/";
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ emantor ];
+    mainProgram = "gensiot";
+    platforms = platforms.unix;
+  };
+}