Make the std feature inert
#250
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In more recent versions of Rust the `Error` trait no longer needs to be gated, so use it through `core::error::Error` to remove the only usage of the `feature = "std"` directive. The `std` feature is left for now to avoid breaking downstream users (if any applicable) but should be removable later.
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Includes bytecodealliance#250.
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In more recent versions of Rust the
Errortrait no longer needs to be gated, so use it throughcore::error::Errorto remove the only usage of thefeature = "std"directive. Thestdfeature is left for now to avoid breaking downstream users (if any applicable) but should be removable later.