Remove Unix.Unix_error from the Gnt module

Signed-off-by: David Scott <dave.scott@citrix.com>
test: use -dontlink unix to verify Unix hasn't crept in

Signed-off-by: David Scott <dave.scott@citrix.com>
Regenerate OASIS

Signed-off-by: David Scott <dave.scott@citrix.com>
Remove the last traces of Unix (the C symbol uerror)

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #8 from djs55/unix

Remove Unix.Unix_error from the Gnt module