s3:smbd: ease file server upgrades from 3.6 and earlier with "acl allow execute aways"

s3:smbd: ease file server upgrades from 3.6 and earlier with "acl allow execute aways"

3.6 and earlier allowed open for execution when execute permissions are
not present on a file. This has been fixed in Samba 4.0.

This patch changes smbd to skip the execute bit from the ACL check
in the open code if "acl allow execute always = yes", hence
re-establishing the old behaviour in this case.

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
(cherry picked from commit 1e29d730663382875d96c275c60e022a1c33a2d1)