Prevent duplicate lang items
Rust does not allow duplicate lang items. When compiled without the `std` feature, `sr-io` defines two lang items. Therefore, `sr-io` compiled without `feature = "std"` must not be linked with `std`. However, `pwasm-utils` and `wasmi-validation` both bring in `std` unless compiled with `default-features = "false"`. This caused a duplicate lang item error. Building both with `default-features = "false"` prevents this error. When building with `feature = "std"`, they should both be built with the `std` feature, so this feature needs to be explicitly depended on.
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