[icu-support] Case insensitive versino of u_strstr()

[Andrei Z. <an...@ya...>]

Do you have any suggestions to how to implement a case-insensitive
version of u_strstr()? I can't simply take both arguments, case-fold
them, and then do the search since the case-folding operation may insert
or delete characters, and I need to return the portion of the original
string that matched the given substring.

- Andrei