build: only emit download ICU warnings once
The check that the user specified icu
in --download
only needs to be
done once and not for each entry in tools/icu/current_ver.dep
.
Fixes: https://github.com/nodejs/node/issues/26860
cc @srl295
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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