Set address and family from hostent (to use with Sys::gethostbyname)

Property definitions

socket $ NativeSocketAddrIn :: fill_from_hostent
	# Set `address` and `family` from `hostent` (to use with `Sys::gethostbyname`)
	fun fill_from_hostent(hostent: NativeSocketHostent) `{
		self->sin_family = hostent->h_addrtype;
		memcpy((char*)&self->sin_addr.s_addr,
		       (char*)hostent->h_addr,
			   hostent->h_length);
	`}
lib/socket/socket_c.nit:286,2--292,3