out that the cookie parser would leak memory when it parses cookies that are
  received with domain, path etc set multiple times in the same header. While
  such a cookie is questionable, they occur in the wild and libcurl no longer
  leaks memory for them. I added such a header to test case 8.

forced to use nmake for VC builds early so that its also used for ares even if we find a GNU make first in path; simplified curl make call.

C-Ares and IPv6 is no longer a bad combo.

tests on machines that have broken DNS configurations (such as
those configured to use OpenDNS).

changed ssh.c to use HAVE_LIBSSH2_SESSION_BLOCK_DIRECTION define provided by libssh2.h; removed related define block from ssh.h.

  https://bugzilla.redhat.com/show_bug.cgi?id=427966 which was libcurl closing
  a bad file descriptor when closing down the FTP data connection.  Caolan
  McNamara seems to be the original author of it.

c-ares can work even with no advapi32.dll at all.

Made OS400 version compilable again

RtlGenRandom, has been located or not. This function is only available on
WinXP and later. When unavailable c-ares uses portable rand() function.