bug#16421: Speed-up for case-insensitive matching in multibyte locales

[Norihiro Tanaka]

Hi Jim,

I thank you for your review for the patch.

I have any requests of any changes for the modified comments and commit
log.

However, can you merge an additional patch, which is attached on this
mail, into the commit?  No longer `kwsincr_case' is called with
case-insensitive matching in a multi-byte locale by two commits.  So it
can be removed.

Norihiro

remove_kwsincr_case.patch
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