XFS: ASCII case-insensitivity support

I've addressed Christoph's comments in these patches.

I've also changed the behaviour of the "ci_match" parameter
being passed to the lookup functions, and kept the use of it
separate from the "name" parameter.

The other change is the xfs_sb_version_hasasciici() name
from "oldci". This is inline with the user-space patch posted
a few days ago.

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