dpms: Add support for DPMSInfoNotify event from DPMS 1.2 (xorgproto)

This allows applications to respond to changes of power level
of a monitor, e.g. an application may stop rendering and related
calculations when the monitor is off.

Related bug: https://bugs.freedesktop.org/57120

Signed-off-by: Alexander Volkov <a.volkov@rusbitech.ru>
4 jobs for dpms in 4 minutes and 55 seconds (queued for 2 seconds)
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debian-testing

00:00:17

 
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autotools

00:04:37

passed #2668430
meson

00:01:43

passed #2668431
meson-noglamor

00:01:30