Fixed some vio code that was using ___WIN__ instead of __WIN__

include/my_global.h:
  set SOCKET_EWOULDBLOCK to the proper windows def WSAEWOULDBLOCK
sql/net_serv.cc:
  fixed typo with using 3 leading underscores instead of 2
vio/vio.c:
  fixed typo with using 3 leading underscores instead of 2
vio/viosocket.c:
  fixed typo with using 3 leading underscores instead of 2

include/my_global.h

@@ -797,7 +797,7 @@ typedef off_t os_off_t;
 #define socket_errno	WSAGetLastError()
 #define SOCKET_EINTR	WSAEINTR
 #define SOCKET_EAGAIN	WSAEINPROGRESS
-#define SOCKET_EWOULDBLOCK WSAEINPROGRESS
+#define SOCKET_EWOULDBLOCK WSAEWOULDBLOCK
 #define SOCKET_ENFILE	ENFILE
 #define SOCKET_EMFILE	EMFILE
 #elif defined(OS2)

sql/net_serv.cc

@@ -132,7 +132,7 @@ my_bool my_net_init(NET *net, Vio* vio)
   if (vio != 0)					/* If real connection */
   {
     net->fd  = vio_fd(vio);			/* For perl DBI/DBD */
-#if defined(MYSQL_SERVER) && !defined(___WIN__) && !defined(__EMX__) && !defined(OS2)
+#if defined(MYSQL_SERVER) && !defined(__WIN__) && !defined(__EMX__) && !defined(OS2)
     if (!(test_flags & TEST_BLOCKING))
     {
       my_bool old_mode;

vio/vio.c

@@ -130,7 +130,7 @@ Vio *vio_new(my_socket sd, enum enum_vio_type type, my_bool localhost)
     sprintf(vio->desc,
 	    (vio->type == VIO_TYPE_SOCKET ? "socket (%d)" : "TCP/IP (%d)"),
 	    vio->sd);
-#if !defined(___WIN__) && !defined(__EMX__) && !defined(OS2)
+#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2)
 #if !defined(NO_FCNTL_NONBLOCK)
 #if defined(__FreeBSD__)
     fcntl(sd, F_SETFL, vio->fcntl_mode); /* Yahoo! FreeBSD patch */
@@ -145,7 +145,7 @@ Vio *vio_new(my_socket sd, enum enum_vio_type type, my_bool localhost)
     {
       /* set to blocking mode by default */
       ulong arg=0, r;
-      r = ioctlsocket(sd,FIONBIO,(void*) &arg, sizeof(arg));
+      r = ioctlsocket(sd,FIONBIO,(void*) &arg);
       vio->fcntl_mode &= ~O_NONBLOCK;
     }
 #endif

vio/viosocket.c

@@ -82,7 +82,7 @@ int vio_blocking(Vio * vio __attribute__((unused)), my_bool set_blocking_mode,
   DBUG_PRINT("enter", ("set_blocking_mode: %d  old_mode: %d",
 		       (int) set_blocking_mode, (int) *old_mode));
 
-#if !defined(___WIN__) && !defined(__EMX__)
+#if !defined(__WIN__) && !defined(__EMX__)
 #if !defined(NO_FCNTL_NONBLOCK)
   if (vio->sd >= 0)
   {
@@ -115,7 +115,7 @@ int vio_blocking(Vio * vio __attribute__((unused)), my_bool set_blocking_mode,
       vio->fcntl_mode |= O_NONBLOCK; /* set bit */
     }
     if (old_fcntl != vio->fcntl_mode)
-      r = ioctlsocket(vio->sd,FIONBIO,(void*) &arg, sizeof(arg));
+      r = ioctlsocket(vio->sd,FIONBIO,(void*) &arg);
   }
 #ifndef __EMX__
   else