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/libredwg/default.nix

@@ -0,0 +1,44 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkg-config, texinfo, pcre2
+, enablePython ? false, python ? null, swig, libxml2, ncurses
+}:
+let
+  isPython3 = enablePython && python.pythonAtLeast "3";
+in
+stdenv.mkDerivation rec {
+  pname = "libredwg";
+  version = "0.12.4";
+
+  src = fetchFromGitHub {
+    owner = "LibreDWG";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-CZZ5/uCls2tY3PKmD+hBBvp7d7KX8nZuCPf03sa4iXc=";
+    fetchSubmodules = true;
+  };
+
+  nativeBuildInputs = [ autoreconfHook pkg-config texinfo ]
+    ++ lib.optional enablePython swig;
+
+  buildInputs = [ pcre2 ]
+    ++ lib.optionals enablePython [ python ]
+    # configurePhase fails with python 3 when ncurses is missing
+    ++ lib.optional isPython3 ncurses
+  ;
+
+  # prevent python tests from running when not building with python
+  configureFlags = lib.optional (!enablePython) "--disable-python";
+
+  doCheck = true;
+
+  # the "xmlsuite" test requires the libxml2 c library as well as the python module
+  checkInputs = lib.optionals enablePython [ libxml2 libxml2.dev ];
+
+  meta = with lib; {
+    broken = stdenv.isDarwin;
+    description = "Free implementation of the DWG file format";
+    homepage = "https://savannah.gnu.org/projects/libredwg/";
+    maintainers = with maintainers; [ tweber ];
+    license = licenses.gpl3Plus;
+    platforms = platforms.all;
+  };
+}