Fix resolution of wasm_bindgen in js! macro
#390
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This fixes an issue that, when a dependent crate depends on
stdwebfor the use of thejs!macro but does not specify the dependencywasm_bindgen, attempting to build for the targetwasm32-unknown-unknown(or usingwasm-packand friends) will yield the following error:Steps to reproduce/verify:
examples/wasm-bindgen-minimal/, execute the commandcargo build --lib --target wasm32-unknown-unknown.