fuzzers/icu_to_case_fuzzer.cc: Add missing include

This unbreaks building the fuzzer with module.

Bug: 40263312
Change-Id: I9e65cec9b2ed638fe552c8244d84cdc5253a0a03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/6720938
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: David Yeung <dayeung@chromium.org>
1 file changed