[arch-general] DMX USB support in AUR

Hi everyone, I created a package for the Enttec Open DMX USB driver. It is available in the AUR under the name dmx_usb-git.

From Wikipedia: DMX512 is a standard for digital communication networks that are commonly used to control stage lighting and effects. It was originally intended as a standardized method for controlling light dimmers

-- Sébastien Leblanc