Rebuild std with threading support

Author: jeroen

.github/workflows/wasm.yml

@@ -15,8 +15,10 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Prepare cargo tests
-      run: rustup target add wasm32-unknown-emscripten
+      run: |
+        rustup target add wasm32-unknown-emscripten --toolchain=nightly
+        rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
 
     - name: Build for wasm
-      run: cargo build --target=wasm32-unknown-emscripten
+      run: cargo +nightly build --target=wasm32-unknown-emscripten -Zbuild-std=panic_abort,std