syslog: setlogmask() to include LOG_INFO

LOG_INFO seems to be excluded by default on some systems (OS X).

src/libcharon/bus/listeners/sys_logger.c

@@ -173,6 +173,7 @@ sys_logger_t *sys_logger_create(int facility)
 	);
 
 	set_level(this, DBG_ANY, LEVEL_SILENT);
+	setlogmask(LOG_UPTO(LOG_INFO));
 
 	return &this->public;
 }