Follow up fix for bug#57450.

batch_readline_init() was modified - make check for 
type of file for input stream unless target platform
is WINDOWS since on this platform S_IFBLK is undefined.

client/readline.cc

@@ -33,10 +33,12 @@ LINE_BUFFER *batch_readline_init(ulong max_size,FILE *file)
   LINE_BUFFER *line_buff;
   MY_STAT input_file_stat;
 
+#ifndef __WIN__
   if (my_fstat(fileno(file), &input_file_stat, MYF(MY_WME)) ||
       MY_S_ISDIR(input_file_stat.st_mode) ||
       MY_S_ISBLK(input_file_stat.st_mode))
     return 0;
+#endif
 
   if (!(line_buff=(LINE_BUFFER*)
         my_malloc(sizeof(*line_buff),MYF(MY_WME | MY_ZEROFILL))))