Instructions for how to disable dynamic linking when compiling to WASM

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bevy/dynamic_linking doesn't work when compiling to WASM:

$ cargo build --lib --target wasm32-unknown-unknown --features bevy/dynamic_linking
error: cannot produce dylib for `bevy_dylib v0.11.3` as the target `wasm32-unknown-unknown` does not support these crate types
$ cargo build --lib --target wasm32-unknown-unknown
    Finished dev [unoptimized + debuginfo] target(s) in 0.31s

The Fast Compiles section of the book should show to to make bevy/dynamic_linking disabled automagically on WASM (or, alternatively, enabled only on x86)

[SIGSTACKFAULT]

Apparently target-specific features is, like, a whole thing rust-lang/cargo#1197

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just found out the book is in bevy/bevy-website; not sure if contributors have a button to move the issue or i should close and open a new one or what.

[daxpedda]

Crate features still work if the dependency is behind a cfg guard.

bevy/Cargo.toml

Line 254 in 3d79dc4

bevy_dylib = { path = "crates/bevy_dylib", version = "0.12.0-dev", default-features = false, optional = true }

could be moved behind a:

[target.'cfg(not(target_family = "wasm"))'.dependencies]

This would make the dynamic_linking crate feature be no-op on Wasm.