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/stow/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchurl, perl, perlPackages }:
+
+let
+  pname = "stow";
+  version = "2.3.1";
+in
+stdenv.mkDerivation {
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "mirror://gnu/stow/stow-${version}.tar.bz2";
+    sha256 = "0bs2b90wjkk1camcasy8kn403kazq6c7fj5m5msfl3navbgwz9i6";
+  };
+
+  buildInputs = with perlPackages; [ perl IOStringy TestOutput ];
+
+  doCheck = true;
+
+  meta = {
+    description = "A tool for managing the installation of multiple software packages in the same run-time directory tree";
+
+    longDescription = ''
+      GNU Stow is a symlink farm manager which takes distinct packages
+      of software and/or data located in separate directories on the
+      filesystem, and makes them appear to be installed in the same
+      place. For example, /usr/local/bin could contain symlinks to
+      files within /usr/local/stow/emacs/bin, /usr/local/stow/perl/bin
+      etc., and likewise recursively for any other subdirectories such
+      as .../share, .../man, and so on.
+    '';
+
+    license = lib.licenses.gpl3Plus;
+    homepage = "https://www.gnu.org/software/stow/";
+    platforms = lib.platforms.all;
+  };
+}