Fix building problems in extra::unicode. #8260
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WIth this patch
RUSTFLAGS='--cfg unicode' make check"
passed successfully.#[link_name="icuuc"]
make libextra to link against libicuuc.so?extra::unicode::tests
,use unicode; unicode::is_foo('a')
failed butuse unicode::*; is_foo('a')
succeeded. Is it right?