Enable wasm32-unknown-unknown support for getrandom if needed

See for details
https://docs.rs/getrandom/0.2.16/getrandom/index.html#webassembly-support.

We only enable it if compiling for WASM, following getrandom's advice to
not enable it unconditionally for our users.

Note that with getrandom 0.3 the feature flag name changes to wasm_js,
and an extra RUSTFLAG is required.

Author: sulami

Cargo.toml

@@ -43,6 +43,8 @@ sha2 = { version = "0.10.7", optional = true, features = ["oid"] }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 js-sys = "0.3"
+# https://docs.rs/getrandom/0.2.16/getrandom/index.html#webassembly-support
+getrandom = { version = "0.2.16", features = ["js"] }
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.1"