whowas: Use the normal rules for IP visibility.

Add the flags (auth{} spoof, dynamic spoof) to struct Whowas and add a
show_ip_whowas().

Normal users now see IPs of unspoofed users, and remote opers can see IPs
behind dynamic spoofs. Also, general::hide_spoof_ips is now applied when
the IP is shown, not when the client exits.

include/whowas.h

@@ -55,6 +55,7 @@ struct Whowas
 	char sockhost[HOSTIPLEN + 1];
 	char realname[REALLEN + 1];
 	char suser[NICKLEN + 1];
+	unsigned char flags;
 	const char *servername;
 	time_t logoff;
 	struct Client *online;	/* Pointer to new nickname for chasing or NULL */
@@ -64,6 +65,10 @@ struct Whowas
 	struct Whowas *cprev;	/* for client struct linked list */
 };
 
+/* Flags */
+#define WHOWAS_IP_SPOOFING	0x1
+#define WHOWAS_DYNSPOOF		0x2
+
 /*
 ** initwhowas
 */