package/brltty: add polkit optional dependency

polkit is an optional dependency (enabled by default) since version 5.4:
https://github.com/brltty/brltty/commit/e62b3c925d03239a372d425fb87b2cac65d8ef19

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 74c6a7e4dba6e81f5403476344b852119d7a53d8)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/brltty/brltty.mk

@@ -92,6 +92,13 @@ else
 BRLTTY_CONF_OPTS += --without-rgx-package
 endif
 
+ifeq ($(BR2_PACKAGE_POLKIT),y)
+BRLTTY_DEPENDENCIES += polkit
+BRLTTY_CONF_OPTS += --enable-polkit
+else
+BRLTTY_CONF_OPTS += --disable-polkit
+endif
+
 ifeq ($(BR2_PACKAGE_SYSTEMD),y)
 BRLTTY_DEPENDENCIES += systemd
 BRLTTY_CONF_OPTS += --with-service-package