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/development/python-modules/filemagic/default.nix

@@ -0,0 +1,30 @@
+{ stdenv, lib, buildPythonPackage, fetchFromGitHub, file
+, isPy3k, mock, unittest2 }:
+
+buildPythonPackage {
+  pname = "filemagic";
+  version = "1.6";
+  disabled = !isPy3k; # asserts on ResourceWarning
+
+  # Don't use the PyPI source because it's missing files required for testing
+  src = fetchFromGitHub {
+    owner = "aliles";
+    repo = "filemagic";
+    rev = "138649062f769fb10c256e454a3e94ecfbf3017b";
+    sha256 = "1jxf928jjl2v6zv8kdnfqvywdwql1zqkm1v5xn1d5w0qjcg38d4n";
+  };
+
+  postPatch = ''
+    substituteInPlace magic/api.py --replace "ctypes.util.find_library('magic')" \
+      "'${file}/lib/libmagic${stdenv.hostPlatform.extensions.sharedLibrary}'"
+  '';
+
+  checkInputs = [ mock ] ++ lib.optionals (!isPy3k) [ unittest2 ];
+
+  meta = with lib; {
+    description = "File type identification using libmagic";
+    homepage = "https://github.com/aliles/filemagic";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ earvstedt ];
+  };
+}