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/enscript/default.nix

@@ -0,0 +1,44 @@
+{ lib, stdenv, fetchurl, gettext }:
+
+stdenv.mkDerivation rec {
+  pname = "enscript";
+  version = "1.6.6";
+
+  src = fetchurl {
+    url = "mirror://gnu/enscript/enscript-${version}.tar.gz";
+    sha256 = "1fy0ymvzrrvs889zanxcaxjfcxarm2d3k43c9frmbl1ld7dblmkd";
+  };
+
+  preBuild =
+    ''
+      # Fix building on Darwin with GCC.
+      substituteInPlace compat/regex.c --replace \
+         __private_extern__  '__attribute__ ((visibility ("hidden")))'
+    '';
+
+  buildInputs = [ gettext ];
+
+  doCheck = true;
+
+  meta = {
+    description = "Converter from ASCII to PostScript, HTML, or RTF";
+
+    longDescription =
+      '' GNU Enscript converts ASCII files to PostScript, HTML, or RTF and
+         stores generated output to a file or sends it directly to the
+         printer.  It includes features for `pretty-printing'
+         (language-sensitive code highlighting) in several programming
+         languages.
+
+         Enscript can be easily extended to handle different output media and
+         it has many options that can be used to customize printouts.
+      '';
+
+    license = lib.licenses.gpl3Plus;
+
+    homepage = "https://www.gnu.org/software/enscript/";
+
+    maintainers = [ ];
+    platforms = lib.platforms.all;
+  };
+}