logerr: use LOG_NDELAY for openlog

This ensures openlog gets a fd so logging of errors can occur
within privsep where no log was written before entering privsep.
Also ensures that closelog does not close -1 on some platforms
where no logging took place.

src/logerr.c

@@ -447,7 +447,7 @@ int
 logopen(const char *path)
 {
 	struct logctx *ctx = &_logctx;
-	int opts = 0;
+	int opts = LOG_NDELAY; /* Ensure openlog gets a fd */
 
 	/* Cache timezone */
 	tzset();