ulogd: forcibly disable mysql when not present

Forcibly disable mysql support when we don't want it since ulogd's
configure script can pick up the host mysql_config thus leading to a
build failure.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ulogd/ulogd.mk

@@ -20,6 +20,8 @@ ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
 ifeq ($(BR2_PACKAGE_MYSQL),y)
 	ULOGD_CONF_OPT += --with-mysql=$(STAGING_DIR)/usr
 	ULOGD_DEPENDENCIES += mysql
+else
+	ULOGD_CONF_OPT += --with-mysql=no
 endif
 ifeq ($(BR2_PACKAGE_SQLITE),y)
 	ULOGD_DEPENDENCIES += sqlite