More infinite/long event next-run-time brute force search paranoia

Don't search more than 1500 days in the future for a next-run date match. This handles erroneous or just bizarre timed event configurations such as February-29 (once ever leap year) or April-31 (never).

src/sbbs3/data.cpp

@@ -140,6 +140,7 @@ extern "C" time_t DLLCALL getnexteventtime(event_t* event)
 {
 	struct tm tm;
 	time_t	t = time(NULL);
+	time_t	now = t;
 
 	if(event->misc & EVENT_DISABLED)
 		return 0;
@@ -160,6 +161,8 @@ extern "C" time_t DLLCALL getnexteventtime(event_t* event)
 		t += 24 * 60 * 60; /* already ran today, so add 24hrs */
 
 	do {
+		if(t > now + (1500 * 24 * 60 * 60)) /* Handle crazy configs, e.g. Feb-29, Apr-31 */
+			return 0;
 		if(localtime_r(&t, &tm) == NULL)
 			return 0;
 		if((event->days & (1 << tm.tm_wday))