Bug#47126 equal flag values causing unexpected behaviour

Although the MY_SYNC_DIR flag supported in my_create(), my_delete(),
   my_rename() and my_symlink(), this feature is not used in the
   mysql code now. So technically we can declare the MY_SYNC_DIR as 0,
   but I decided to assign a new value for it as it's probably safer and
   worths nothing.

per-file comments:
  include/my_sys.h
Bug#47126      equal flag values causing unexpected behaviour
     assign unique value for the MY_SYNC_DIR

include/my_sys.h

@@ -60,7 +60,7 @@ extern int NEAR my_errno;		/* Last error in mysys */
 #define MY_WME		16	/* Write message on error */
 #define MY_WAIT_IF_FULL 32	/* Wait and try again if disk full error */
 #define MY_IGNORE_BADFD 32      /* my_sync: ignore 'bad descriptor' errors */
-#define MY_SYNC_DIR     1024    /* my_create/delete/rename: sync directory */
+#define MY_SYNC_DIR     8192    /* my_create/delete/rename: sync directory */
 #define MY_RAID         64      /* Support for RAID */
 #define MY_FULL_IO     512      /* For my_read - loop intil I/O is complete */
 #define MY_DONT_CHECK_FILESIZE 128 /* Option to init_io_cache() */