unicode updates

Other than the update to MAINTAINERS, this PR has only a fix to stop
ecryptfs from inadvertently mounting case-insensitive filesystems that
it cannot handle, which would otherwise caused post-mount failures.  It
has been on linux-next for the past month and a half.

As a side note, the optimization to the case-insensitive comparison code
that you suggested, and the negative dentry support are still on the
list, and were postponed to the next release.
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