cache within the multi handle.

server as part of test cases

for easier future error-tracking.

the two first lines to get the version string. The good news is that older
libtools have an empty line after the first so I think this works fine all
over...

  while not fixing things very nicely, it does make the SOCKS5 proxy
  connection slightly better as it now acknowledges the timeout for connection
  and it no longer segfaults in the case when SOCKS requires authentication
  and you did not specify username:password.

them.

" !defined(__GNUC__) || defined(__MINGW32__)" implies
CygWin.

name resolves. It could get stuck in the wrong state.

 o made ares_version.h use extern "C" for c++ compilers
 o fixed compiler warnings in ares_getnameinfo.c
 o fixed a buffer position init for TCP reads

allow applications to set their own socket options.

properly if you removed a "live" handle from a multi handle with
curl_multi_remove_handle().