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PPP is now pointerful for a while, we don't need anymore accessor functions for the unique PPP local and static control block. Replaced ppp_set_netif_statuscallback() and ppp_set_netif_linkcallback() functions to defines. Removed pppapi_do_ppp_set_netif_statuscallback() and pppapi_do_ppp_set_netif_linkcallback(), they were useless because netif_set_status_callback() and netif_set_link_callback() can be safely called while PPP status is in dead (= non open) state and even before the PPP session is actually created at all.