HAVE_GETADDRINFO_THREADSAFE definition for non-configure win32 builds

add inclusion of curl_memory.h

adjust preprocessor symbol definition check relative to resolver specialty

PKTSIZE might have been already defined in arpa/tftp.h

from hostip.h to setup.h in order to allow proper inclusion in any file.

This represents no functional change at all in which resolver is used,
everything still works as usual, internally and externally there is no
difference in behavior.

also says so. I also made the list of protocols get sorted.

s/RTPDATA/INTERLEAVEDATA/

'note' in most description as it is mostly useless.

removal of Curl_addrinfo_copy(), Curl_addrinfo6_callback(), and
Curl_addrinfo4_callback()

libcurl options for controlling what to get and how to receive posssibly
interleaved RTP data. Initial commit.

the code more curl-style

killing a sockfilter process the actual PID from the pid file is used and
not the one returned by open2() which might be different.

indicates that only one of the two possible sockfilter processes should be
killed.  Valid values for this parameter are 'main' and 'data'.