package/weston: add option to build seatd-based launcher

Since version 10, the weston-launch command has been deprecated, and
can only be built with -Ddeprecated-weston-launch=true, which
Buildroot does not do.

So the only launcher currently available is logind, provided by
systemd.

But weston provides an alternate way, based on the seatd daemon. This
commit enables this possibility by adding an optional dependency on
BR2_PACKAGE_SEATD and using -Dlauncher-libseat=true.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/weston/weston.mk

@@ -35,6 +35,13 @@ else
 WESTON_CONF_OPTS += -Dlauncher-logind=false
 endif
 
+ifeq ($(BR2_PACKAGE_SEATD),y)
+WESTON_CONF_OPTS += -Dlauncher-libseat=true
+WESTON_DEPENDENCIES += seatd
+else
+WESTON_CONF_OPTS += -Dlauncher-libseat=false
+endif
+
 ifeq ($(BR2_PACKAGE_JPEG),y)
 WESTON_CONF_OPTS += -Dimage-jpeg=true
 WESTON_DEPENDENCIES += jpeg