removal of Curl_addrinfo_copy(), Curl_addrinfo6_callback(), and Curl_addrinfo4_callback()
… writing of messages atomic, on systems where an fwrite of a memory buffer is atomic.
…les to setup_once.h. Inclusion of each header file is based on the definition of NEED_MALLOC_H and NEED_MEMORY_H respectively.
implementation from lib/hostip6.c to lib/curl_addrinfo.c and prototypes from lib/hostip.h to lib/curl_addrinfo.h
…lable. Use a wrapper function to call system's getaddrinfo().
…LLOC_H shall be defined if <malloc.h> header file must be included even when including <stdlib.h>.
…ameter used in getnameinfo() to receive the length of the sockaddr struct.