Re-establish feature resolver version 1 compatibility #4327
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These changes re-establish feature resolver version 1 compatibility.
Instead of using crate features we use macros defined in
wasm_bindgen::__rt. This was possible because we movedallow_internal_unstablefrom the proc-macro to these new macros.Thanks @taiki-e for proposing and finding this solution.
Fixes #4304.
Replaces #4306.
Reverts #4284.
Reverts #4307.