Allow unsupporting "js" feature #342
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Some Wasm platforms (e.g. Cosmwasm) do not support bindgen.
On the other hand, a lot of libraries with Wasm support activate the "js" feature.
This PR allows the final crate to set getrandom to
UNSUPPORTED, avoiding this issue.Specifically, it can run
RUSTFLAGS='--cfg js_unsupported' cargo buildetc.