Bug#1128832: RM: rust-wasm-bindgen-backend -- RoM; uninstallable - dropped upstream

[Peter Green]

Package: ftp.debian.org

Upstream has restructured the wasm-bindgen stack so the wasm-bindgen-backend
crate is no-longer used or maintained and the last version released is not
compatible with the version of the wasm-bindgen stack currently in sid.