dynamic and static c-ares libraries in debug and release flavours.

Additionally each of the three sample programs is built against
each of the four possible c-ares libraries, generating all this
a total number of 12 executables and 4 libraries.

don't ignore these subdirs, they must be removed first

that lacks the writev function.

lacks the strcasecmp function.

  ares_expand_string.c

ahost are ws2_32.lib and advapi32.lib

c-ares library. It is just a convinience source code helper function
for use in example programs adig.c and ahost.c

Replace <winsock.h> with <winsock2.h> + <ws2tcpip.h>
(ala libcurl since IPv6 is not optional now).

Removed ares_free_errmem.c from MSCV project files.
Fixed line-endings to CR-LF.