iptraf fix

[Alex <vasile@death.yi.org>]

If you want to make iptraf 2.1.x work with your dvb interface, a quick fix
will be to replace:

---
#define NUM_SUPPORTED_IFACES 8

extern int daemonized;

char ifaces[NUM_SUPPORTED_IFACES][6] =
{"lo", "eth", "sl", "ppp", "ippp", "plip", "fddi", "isdn"};
---

with 

---
#define NUM_SUPPORTED_IFACES 9

extern int daemonized;

char ifaces[NUM_SUPPORTED_IFACES][6] =
{"lo", "eth", "sl", "ppp", "ippp", "plip", "fddi", "isdn", "dvb"};
---