task #10139 (Prefer statically allocated memory): added autoip_set_struct() and dhcp_set_struct() to let autoip and dhcp work with user-allocated structs instead of callin mem_malloc

src/include/ipv4/lwip/autoip.h

@@ -92,6 +92,9 @@ struct autoip
 /** Init srand, has to be called before entering mainloop */
 void autoip_init(void);
 
+/** Set a struct autoip allocated by the application to work with */
+void autoip_set_struct(struct netif *netif, struct autoip *autoip);
+
 /** Start AutoIP client */
 err_t autoip_start(struct netif *netif);
 

src/include/lwip/dhcp.h

@@ -105,6 +105,7 @@ PACK_STRUCT_END
 #  include "arch/epstruct.h"
 #endif
 
+void dhcp_set_struct(struct netif *netif, struct dhcp *dhcp);
 /** start DHCP configuration */
 err_t dhcp_start(struct netif *netif);
 /** enforce early lease renewal (not needed normally)*/