Simplify check for NEED_MALLOC_H, and make more explicit that NEED_MALLOC_H shall be defined if <malloc.h> header file must be included even when including <stdlib.h>.

Curl_freeaddrinfo() and Curl_ip2addr().

(more logical).

protocol sockets even if the resolved address may say otherwise

added. TODO: add them to docs. add TFTP server to test suite. add TFTP to
list of protocols whereever those are mentioned.

  inet_addr() functions seems to use &255 on all numericals in a ipv4 dotted
  address which makes a different failure... Now I've modified the ipv4
  resolve code to use inet_pton() instead in an attempt to make these systems
  better detect this as a bad IP address rather than creating a toally bogus
  address that is then passed on and used.

variable to sort out some compiler warnings.

of typecasts all over

linked list for name resolved data, even on hosts/systems with only IPv4
stacks as this simplifies a lot of code.

memory.h is included everywhere for this.

warnings

usage.