include <malloc.h> only if HAVE_MALLOC_H and NEED_MALLOC_H are both defined.

Ingmar Runge provided a source snippet that caused a crash. The reason for
the crash was that libcurl internally was a bit confused about who owned the
DNS cache at all times so if you create

Ingmar Runge provided a source snippet that caused a crash. The reason for
the crash was that libcurl internally was a bit confused about who owned the
DNS cache at all times so if you created an easy handle that uses a shared
DNS cache and added that to a multi handle it would crash. Now we keep more
careful internal track of exactly what kind of DNS cache each easy handle
uses: None, Private (allocated for and used only by this single handle),
Shared (points to a cache held by a shared object), Global (points to the
global cache) or Multi (points to the cache within the multi handle that is
automatically shared between all easy handles that are added with private
caches).

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Roland Blom filed bug report #1481217
(http://curl.haxx.se/bug/view.cgi?id=1481217), with follow-ups by Michele Bini
and David Byron. libcurl previously wrongly used GetLastError() on windows

Roland Blom filed bug report #1481217
(http://curl.haxx.se/bug/view.cgi?id=1481217), with follow-ups by Michele Bini
and David Byron. libcurl previously wrongly used GetLastError() on windows to
get error details after socket-related function calls, when it really should
use WSAGetLastError() instead.

When changing to this, the former function Curl_ourerrno() is now instead
called Curl_sockerrno() as it is necessary to only use it to get errno from
socket-related functions as otherwise it won't work as intended on Windows.

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Use the HAVE_MALLOC_H and HAVE_PROCESS_H defines
(more logical).

Shmulik Regev provided a fix for the DNS cache when using short life times,
as previously it could be holding on to old cached entries longer than
requested.

only define _REENTRANT if not already defined, and only in setup.h

FTP code turned into state machine. Not completely yet, but a good start.
The tag 'before_ftp_statemachine' was set just before this commit in case
of future need.

Use plain structs and not typedef'ed ones in the hash and linked-list code.

Dan Fandrich fix: eliminates some pedantic CodeWarrior compiler warnings and
errors.

Prevent a longjmp warning by moving the rc assign within Curl_resolv().
Andy Cedilnik reported. Warning on HP-UX?

removed tabs and trailing whitespace from source

Made the dns entry remain locked while a connection to the host remains to
allow verbose output during this period. Bertrand Demiddelaer reported and
helped fixing.

the _num_chars() function is not used, removing

Replaced all uses of sprintf() with the safer snprintf(). It is just a
precaution to prevent mistakes to lead to buffer overflows.

made the Curl_he2ai() take the port number as an int intead, to avoid lots
of typecasts all over

prevent warning

Source cleanups. The major one being that we now _always_ use a Curl_addrinfo
linked list for name resolved data, even on hosts/systems with only IPv4
stacks as this simplifies a lot of code.

removed trailing whitespace

Gisle corrected two comments

Gisle Vanem's improved verbose output and timeout handling when connecting to
a host name that resolves to multiple IP addresses.

if shrinking the buffer fails, use the older larger one

curl_global_init_mem() allows the memory functions to be replaced.
memory.h is included everywhere for this.

improved the cleaning up of memory when we fail to resolve names due to
out of memory (thanks to 'runtests.pl -t')

Made defines instead of plain numbers for the Curl_resolv() return code to
make the code easier to read

Major hostip.c cleanup and split into multiple files and easier #ifdef
usage.