Prospective CI fix for warnings about unexpected cfg

[ogoffart]

error: unexpected `cfg` condition value: `noop`
  --> api/node/rust/lib.rs:17:1
   |
17 | #[napi]
   | ^^^^^^^
   |
   = note: expected values for `feature` are: `accessibility`, `backend-linuxkms`, `backend-linuxkms-noseat`, `backend-qt`, `backend-winit`, `backend-winit-wayland`, `backend-winit-x11`, `default`, `renderer-femtovg`, `renderer-skia`, `renderer-skia-opengl`, `renderer-skia-vulkan`, `renderer-software`, and `testing`
   = help: consider adding `noop` as a feature in `Cargo.toml`
   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
   = note: `-D unexpected-cfgs` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(unexpected_cfgs)]`
   = note: this error originates in the attribute macro `napi` (in Nightly builds, run with -Z macro-backtrace for more info)

error: unexpected `cfg` condition value: `used_linker`
  --> api/node/rust/lib.rs:17:1
   |
17 | #[napi]
   | ^^^^^^^
   |
   = note: expected values for `feature` are: `accessibility`, `backend-linuxkms`, `backend-linuxkms-noseat`, `backend-qt`, `backend-winit`, `backend-winit-wayland`, `backend-winit-x11`, `default`, `renderer-femtovg`, `renderer-skia`, `renderer-skia-opengl`, `renderer-skia-vulkan`, `renderer-software`, and `testing`
   = help: consider adding `used_linker` as a feature in `Cargo.toml`
   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
   = note: this error originates in the attribute macro `napi::bindgen_prelude::ctor` (in Nightly builds, run with -Z macro-backtrace for more info)a

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