feat: Add optional dep-of-std feature #45
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Adds two optional dependencies 'core' and 'compiler-builtins' so this crate can be used inside the rust standard library.
Trying to use it here: rust-lang/rust#81807, but this won't compile unless this feature is added. This is identical to how it is implemented in cfg-if: https://github.com/alexcrichton/cfg-if/blob/main/Cargo.toml