Fix hang on "Loading IRCd configuration" if DNS is not working correctly.

For example if the 1st DNS resolver is refusing or ignoring requests.
We forgot to call unrealdns_timeout() in the waiting loop, so DNS requests
never timed out and c-ares didn't try the 2nd/3rd server either.

Issue reported by Elodie.

include/h.h

@@ -859,6 +859,7 @@ extern const char *cmdname_by_spamftarget(int target);
 extern void unrealdns_delreq_bycptr(Client *cptr);
 extern void unrealdns_gethostbyname_link(const char *name, ConfigItem_link *conf, int ipv4_only);
 extern void unrealdns_delasyncconnects(void);
+extern EVENT(unrealdns_timeout);
 extern int is_autojoin_chan(const char *chname);
 extern void unreal_free_hostent(struct hostent *he);
 extern struct hostent *unreal_create_hostent(const char *name, const char *ip);

src/dns.c

@@ -113,7 +113,7 @@ static int unrealdns_sock_create_cb(ares_socket_t fd, int type, void *data)
 	return ARES_SUCCESS;
 }
 
-static EVENT(unrealdns_timeout)
+EVENT(unrealdns_timeout)
 {
 	ares_process_fd(resolver_channel, ARES_SOCKET_BAD, ARES_SOCKET_BAD);
 }

src/ircd.c

@@ -1056,6 +1056,7 @@ int InitUnrealIRCd(int argc, char *argv[])
 		gettimeofday(&timeofday_tv, NULL);
 		timeofday = timeofday_tv.tv_sec;
 		url_socket_timeout(NULL);
+		unrealdns_timeout(NULL);
 		fd_select(500);
 	}
 	if (config_test() < 0)