With the upcoming fixes to FIFO in wayland, it should be preferable to
use FIFO instead of our own hacky heuristic. This means
--wayland-disable-vsync should become a tristate option with an "auto"
behavior (not implemented in this commit). The semantics have to
slightly change so introduce --wayland-internal-vsync and deprecate
--wayland-disable-vsync.

A very long time annoyance with wayland was compositors indefinitely
blocking our vo thread if the surface gets occluded in some way. We've
worked around this by using mailbox and our own custom vsync function.
Thankfully it looks like people are finally solving this and with these
two protocols it should be possible to guarantee forward progress on
vulkan which means all the workarounds we do shouldn't be needed. So we
can just request fifo in this case as a default since all we want is
standard vsync blocking.