brltty: add optional at-spi2-core dependency

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/brltty/brltty.mk

@@ -11,7 +11,8 @@ BRLTTY_INSTALL_STAGING_OPTS = INSTALL_ROOT=$(STAGING_DIR) install
 BRLTTY_INSTALL_TARGET_OPTS = INSTALL_ROOT=$(TARGET_DIR) install
 BRLTTY_LICENSE_FILES = LICENSE-GPL LICENSE-LGPL
 
-BRLTTY_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES) host-autoconf host-pkgconf
+BRLTTY_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES) host-autoconf host-pkgconf \
+	$(if $(BR2_PACKAGE_AT_SPI2_CORE),at-spi2-core)
 
 BRLTTY_CONF_OPTS = \
 	--disable-java-bindings \