main/nodejs: build with small-icu as it used to be in nodejs-12.x.y
small-icu used to be the default value before nodejs 14.x. If the user needs ICU data for others than English, they can install icu-data package. This is a temporary solution for Alpine 3.13. I'm planning to improve ICU packaging and compile Node against system-provided ICUfor the next Alpine release.
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