Arch Linux: Fixing empty/blank windows for graphical applications that require root

When running applications such as "unetbootin" or "tuxboot",
you might get a blank window, instead of the actual application.
Even when running it through "gksudo", or having a decent polkit running (e.g. inside Gnome).

E.g.:

This is because these application use MIT_SHM (Shared memory), which for some reason does not work when running graphical applications as root, while being logged in as a regular user in X.

The solution is to disable MIT_SHM.

E.g.:

$ sudo QT_X11_NO_MITSHM=1 tuxboot

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