Bug in vi + patch

[Dan Moinescu]

Hi,

If busybox is configured with CONFIG_FEATURE_VI_REGEX_SEARCH=y, then
all searches in vi are case-sensitive, even if ":set ignorecase" is in
effect. The attached patch solves this problem (the code is based on
the example on doing case-insensitive regex searches at
http://www.gnu.org/software/gnulib/manual/html_node/GNU-Translate-Tables.html#GNU-Translate-Tables).

Regards,
Dan.
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