Update seatd to version 0.7.0, which includes a flurry of small fixes
and removes usage of the SEATD_SOCK and SEATD_LOGLEVEL environment
variables (the latter replaced by a command line switch).
Release notes: https://git.sr.ht/~kennylevinsen/seatd/refs/0.7.0
The -Dlibseat-logind= option now needs the "systemd" value when the
logind backend is systemd-logind, this patch adapts usage of the build
option accordingly.
Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>