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/applications/graphics/gocr/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchurl, tk }:
+
+stdenv.mkDerivation rec {
+  pname = "gocr";
+  version = "0.52";
+
+  src = fetchurl {
+    url = "https://www-e.uni-magdeburg.de/jschulen/ocr/gocr-${version}.tar.gz";
+    sha256 = "11l6gds1lrm8lwrrsxnm5fjlwz8q1xbh896cprrl4psz21in946z";
+  };
+
+  buildFlags = [ "all" "libs" ];
+  installFlags = [ "libdir=/lib/" ]; # Specify libdir so Makefile will also install library.
+
+  preInstall = "mkdir -p $out/lib";
+
+  postInstall = ''
+    for i in pgm2asc.h gocr.h; do
+      install -D -m644 src/$i $out/include/gocr/$i
+    done
+  '';
+
+  preFixup = ''
+    sed -i -e 's|exec wish|exec ${tk}/bin/wish|' $out/bin/gocr.tcl
+  '';
+
+  meta = {
+    homepage = "http://jocr.sourceforge.net/";
+    description = "GPL Optical Character Recognition";
+    license = lib.licenses.gpl2;
+    platforms = lib.platforms.linux;
+  };
+}