evutil: Fix evutil_freeaddrinfo During testing on win32, util/getaddrinfo failed with NULL hint info r = evutil_getaddrinfo("www.google.com", NULL, NULL, &ai); throwing a critical heap exception when evutil_freeaddrinfo is called. This is because of improper use of freeaddrinfo when nodes within the ai structure are allocated using mm_malloc or mm_calloc (EVUTIL_AI_LIBEVENT_ALLOCATED) This adds the flag in apply_socktype_protocol_hack and walks the linked list in evutil_freeaddrinfo removing linked list nodes that are custom allocated before calling freeaddrinfo.