(w32_getpw, w32_socket, w32_connect, w32_recv, w32_send,

w32_writev_socket, w32_close_socket, getpass, w32_openfd,
w32_openhandle, w32_readv_handle, w32_close_handle,
sysdep_init, sysdep_stdin_init, w32_select, w32_signal_handler,
sigaction, stdin_read_thread, w32_ring_from_file_to_bounce_buf)
[_WIN32]: New w32 equivalent functions for POSIX functions.
(recvline, sendcmd, tcp_connect, hostconnect, getpass,
main, intr, play, ring_to_file, ring_from_file, doexecute,
doredir) [_WIN32]: Use new WIN32 equivalent functions.
(main) [_WIN32]: Add sysdep_init() to support system dependent
initialization for equivalence functions.
(play) [_WIN32]: Add sysdef_stdin_init() to support system
dependent initialization for reading stdin.
(recv_input, play) [_WIN32]: Replace the calls to ring_to_file()
and select() with WIN32 specific enhanced versions.

Makefile.in: update dependencies with new files.
Make.mk: Add using of getopt.c and getopt.h
from src/lib/w32 directory.  Add getopt.c and getopt.h
to tar for client.

src/client/ringbuf.c

@@ -36,8 +36,16 @@
 #include <assert.h>
 #include <stdio.h>
 #include <string.h>
+#ifndef _WIN32
 #include <sys/uio.h>
 #include <unistd.h>
+#else
+#define readv(fd, iov, iovcnt) \
+    w32_readv_handle((fd), (iov), (iovcnt))
+#define writev(fd, iov, iovcnt) \
+    w32_writev_socket((fd), (iov), (iovcnt))
+#endif
+#include "misc.h"
 #include "ringbuf.h"
 
 /*