Update POSIX negotiate context during negprot to include GUID

[Steve French]

As requested - updated the POSIX negotiate context to include the GUID
of the only supported POSIX open/create context.

Let me know if any objections..

Tested with JRAs tree and worked fine, other than unrelated problem
(appears to be in server code) where the world writeable bit is always
masked off on mkdir (could be user error but smb.conf looked ok to me
and worked with his older tree for all modes).  Other modes (other
than setuid/setgid/sticky) work fine on directory create.

-- 
Thanks,

Steve
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