<sys/time.h>.

Prevent definition of HAVE_WINxxx_H symbols and avoid inclusion of Windows headers when compiled with Cygwin in POSIX emulation mode.

interface and the change could break the compilation of thrid
party apps which link against this library.

windows.h winsock.h winsock2.h ws2tcpip.h is done in setup.h

sets the required HAVE_xx defines for non-DOS/Win targets.

Basically in loops like handle_errors(), 'query->next' was assigned a local
variable and then query was referenced after the memory was freed by
next_server(). I've changed that so next_server() and end_query() returns the
next query. So callers should use this ret-value.

The next problem was that 'server->tcp_buffer_pos' had a random value at entry
to 1st recv() (luckily causing Winsock to return ENOBUFS).

I've also added a ares_writev() for Windows to streamline the code
a bit more.

added prototypes for the strcasecmp() functions

namespace