Fix docs: artifact dependency path needs to be accessed using env::var_os instead of env!
#296
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…` instead of `env!` Artifact dependencies are available through the `env!` macro only in binaries/libraries. In build scripts, the env variable is set at runtime instead.
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Artifact dependencies are available through the
env!macro only in binaries/libraries. In build scripts, the env variable is set at runtime instead.Fixes #295