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/misc/geteltorito/default.nix

@@ -0,0 +1,48 @@
+{ lib, stdenv, perl, ronn, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "geteltorito";
+  version = "0.6";
+
+  src = fetchurl {
+    url = "https://userpages.uni-koblenz.de/~krienke/ftp/noarch/geteltorito/geteltorito-${version}.tar.gz";
+    sha256 = "1gkbm9ahj2mgqrkrfpibzclsriqgsbsvjh19fr815vpd9f6snkxv";
+  };
+
+  buildInputs = [ perl ronn ];
+
+  unpackCmd = "";
+  dontBuild = true;
+  configurePhase = "";
+  installPhase = ''
+    # reformat README to ronn markdown
+    cat > README.new <<EOF
+    geteltorito -- ${meta.description}
+    ===========
+
+    ## SYNOPSIS
+
+    EOF
+
+    # skip the first two lines
+    # -e reformat function call
+    # -e reformat example
+    # -e make everything else (that is no code) that contains `: ` a list item
+    tail -n +3 README | sed \
+        -e 's/^\(call:\s*\)\(getelt.*\)$/\1`\2`/' \
+        -e 's/^\(example:\s*\)\(getelt.*\)$/\1 `\2`/' \
+        -e 's/^\(.*: \)/- \1/g' \
+           >> README.new
+    mkdir -p $out/man/man1
+    ronn --roff README.new --pipe > $out/man/man1/geteltorito.1
+    install -vD geteltorito $out/bin/geteltorito
+  '';
+
+  meta = with lib; {
+    description = "Extract the initial/default boot image from a CD image if existent";
+    homepage = "https://userpages.uni-koblenz.de/~krienke/ftp/noarch/geteltorito/";
+    maintainers = [ maintainers.Profpatsch ];
+    license = licenses.gpl2;
+  };
+
+}