Fixes#8471.
Ensures that `npm take-forever` (aka `npm ci`, `npm install`) only runs
once during a parent/child build script run.
Note that this also works even where build scripts manually call other
build scripts (e.g. input-processor as it is currently calling kmc
build manually) -- though this is not a recommended practice.
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License
Copyright (c) SIL International.
Keyman is an open source project distributed under the MIT license.