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Cargo automatically registers environment variable as dependency if `env!` or `option_env!` is used, while `std::env::var` would require a manual `cargo:rerun-if-env-changed` print. Thus switch to use the macro. Signed-off-by: Gary Guo <gary@garyguo.net>
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Cargo automatically registers environment variable as dependency if
env!oroption_env!is used, whilestd::env::varwould require a manualcargo:rerun-if-env-changedprint. Thus switch to use the macro.