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)
latest
Status Name Job ID Coverage
  Docker Image
passed debian-testing #2668428

00:00:17

 
  Build And Test
passed autotools #2668429

00:04:37

passed meson #2668430

00:01:43

passed meson-noglamor #2668431

00:01:30