A couple of notes on this package:

- I took the patch for fixing 64-bit bug from
  <https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/X11/wmctrl/64-bit-data.patch>.
  Should the header comment be changed?

- I tested it only on 32-bit machine so I don't really know how it works
  on 64-bit.

- Is it ok to make "wmctrl.scm" or would it be more appropriate to put
  it into "xdisorg.scm"?