ACL support 2.2.7a

[Björn Rodén]

I used the following environment:
- Samba 2.2.7a
- AIX 5.2
- PDC on NT

Operations that work:
- Change a manually added, with acledit, acl user or group entry from NT
- Remove a manually, added, with acledit, acl user or group entry from NT

 Operations that does not work:
- Add acl user or group entry from NT (the user can manually add acl entries
with acledit on the file)

This worked on AIX 5.1 with Samba 2.2.5 (tested with users). Maybe the acl
structures has been changed in AIX 5.2?

Logfile shows that chacl() sets errno 2 (ENOENT) indicating that the file
does not exist:
 ...
 Starting AIX sys_acl_set_permset
 entry->ace_access = 448
 Ending AIX sys_acl_set_permset
 user_obj=1, group_obj=1, other_obj=1
 Entering sys_acl_set_file
 File name is testit.txt
 errno is 2
 return code is 0
 Exiting the sys_acl_set_file
 ...

 ls -l testit.txt:
 total 1
 -rwxrwxrwx   1 aaa      a                24 Jan 21 14:42 testit.txt

 aclget testit.txt:
 attributes:
 base permissions
     owner(aaa):  rwx
     group(a):  rwx
     others:  rwx
 extended permissions
     enabled