package/weston: remove launcher-libseat meson option

This option only exists in main and is not in a release.

Fixes:
output/build/weston-9.0.0/meson.build:1:0: ERROR: Unknown options: "launcher-libseat"

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/weston/weston.mk

@@ -26,13 +26,6 @@ else
 WESTON_CONF_OPTS += -Dsimple-clients=
 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_DBUS)$(BR2_PACKAGE_SYSTEMD),yy)
 WESTON_CONF_OPTS += -Dlauncher-logind=true
 WESTON_DEPENDENCIES += dbus systemd