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/interpreters/npiet/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, stdenv
+, fetchurl
+, gd
+, giflib
+, groff
+, libpng
+, tk
+}:
+
+stdenv.mkDerivation rec {
+  pname = "npiet";
+  version = "1.3f";
+
+  src = fetchurl {
+    url = "https://www.bertnase.de/npiet/npiet-${version}.tar.gz";
+    sha256 = "sha256-Le2FYGKr1zWZ6F4edozmvGC6LbItx9aptidj3KBLhVo=";
+  };
+
+  buildInputs = [ gd giflib libpng ];
+
+  nativeBuildInputs = [ groff ];
+
+  postPatch = ''
+    # malloc.h is not needed because stdlib.h is already included.
+    # On macOS, malloc.h does not even exist, resulting in an error.
+    substituteInPlace npiet-foogol.c \
+        --replace '#include <malloc.h>' ""
+
+    substituteInPlace npietedit \
+        --replace 'exec wish' 'exec ${tk}/bin/wish'
+  '';
+
+  meta = with lib; {
+    description = "An interpreter for piet programs. Also includes npietedit and npiet-foogol";
+    longDescription = ''
+      npiet is an interpreter for the piet programming language.
+      Instead of text, piet programs are pictures. Commands are determined based on changes in color.
+    '';
+    homepage = "https://www.bertnase.de/npiet/";
+    license = licenses.gpl2Only;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ Luflosi ];
+  };
+}