Regression introduced by f91dacdd07.
Accidentally thought that it's compiling with XRandR support enabled,
because the cmake output said so:
Looking for XRRQueryExtension in Xrandr - found
Unfortunately, despite this message, the relevant part is:
Looking for XRRNotifyEvent - not found
So, ea4afb7 still holds true and I've added a small comment to avoid
this from happening in the future.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>