Use real setters for the eventlog config.

This makes it possible to have a base config that the callers can
modify instead of replacing the config wholesale.

plugins/sudoers/stubs.c

@@ -89,7 +89,7 @@ set_cmnd_path(const char *runchroot)
 
 /* STUB */
 void
-update_eventlog_config(void)
+init_eventlog_config(void)
 {
     return;
 }