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/text/enca/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl, libiconv, recode }:
+
+stdenv.mkDerivation rec {
+  pname = "enca";
+  version = "1.19";
+
+  src = fetchurl {
+    url = "https://dl.cihar.com/enca/${pname}-${version}.tar.xz";
+    sha256 = "1f78jmrggv3jymql8imm5m9yc8nqjw5l99mpwki2245l8357wj1s";
+  };
+
+  buildInputs = [ recode libiconv ];
+
+  meta = with lib; {
+    description = "Detects the encoding of text files and reencodes them";
+
+    longDescription = ''
+        Enca detects the encoding of text files, on the basis of knowledge
+        of their language. It can also convert them to other encodings,
+        allowing you to recode files without knowing their current encoding.
+        It supports most of Central and East European languages, and a few
+        Unicode variants, independently on language.
+    '';
+
+    license = licenses.gpl2;
+
+  };
+}