fix compiler warning

- To allow an app to force a re-read of /etc/resolv.conf etc, pretty much
  like the res_init() resolver function offers

  check for broken connections like ares_process() did. Based on that, I
  merged the two functions into a single generic one with two front-ends.

  replaced with equivalent /RTCsu for Visual Studio 2003 and newer versions.

- Compiler option /GX is now replaced with equivalent /EHsc for all versions.

  did not include a definition for HAVE_CLOSESOCKET which resulted in
  function close() being inappropriately used to close sockets.

  which might contain non-SRV answers, skipping over potential non-SRV
  ones such as CNAMEs.

  CARES_HAVE_ARES_FREE_DATA. Current functionality of ares_free_data()
  makes it unnecessary.

  ares_addr6ttl in order to prevent name space pollution, along with
  necessary changes to code base and man pages.This change does not break
  ABI, there is no need to recompile existing applications. But existing
  applications using these structs with the old name will need source code
  adjustments when recompiled using c-ares 1.6.1.

  with the ones declared in ares.h

Make configure remove the ares_build.h file included in distribution tarballs.

Fix macro redefinition.

Fix name space pollution.

Allow using different extra import libraries for debug and release builds.

Add manifest stuff to msvc makefile

  CARES_HAVE_ARES_FREE_DATA as an indication of function availability.

to return a linked lists of results. These were also modified to internally
use the ares_data memory struct and as such its result must be free'ed with
ares_free_data().

applications to free memory allocated and returned by some c-ares funtions.