Remove the "stat_open()" function, flag, and all associated code. It was only

Remove the "stat_open()" function, flag, and all associated code. It was only
being (correctly) used in the can_read/can_write checks for hide unreadable/unwritable
and this is more properly done using the functions in smbd/file_access.c.
Preparing to do NT access checks on all file access.
Jeremy.
(This used to be commit 6bfb06ad95963ae2acb67c4694a98282d3b29faa)