utils: add new gdm-disable-wayland binary
We currently disable wayland for cirrus by calling printf from a udev rule. This works, but it's a little too open coded to easily write SELinux policy for.
This commit introduces a new program, gdm-disable-wayland, that does the same thing, but in a dedicated binary.
A future commit will change the udev rule to use the binary.
https://bugzilla.gnome.org/show_bug.cgi?id=796315
(cherry picked from commit 2dc57da3)
closes #412 (closed)