[lwip-members] RFC: netif_add change

[Jani Monoses]

Hi
I propose that netif_add received the struct netif * argument pointing to an 
already allocated
struct.This way netif.c does not depend on mem_malloc and the app can either 
use alloc or pass
a static var.Someday all lwip should work with only statically alloced memory :)
Except the main user (PBUF_RAM) only dhcp uses dynamic memory in lwip core 
files.

Jani.