fix: minor issues with CI

* update ctor

* pass empty `RUSTFLAGS` when installing cross, overriding
the default `-D warnings`

* fix some clippy lints

* create `target` directory before curling wasmtime lib

.github/workflows/build.yml

@@ -88,7 +88,8 @@ jobs:
 
     - name: Install cross
       if: ${{ matrix.use-cross }}
-      run: cargo install cross --git https://github.com/cross-rs/cross
+      # TODO: Remove 'RUSTFLAGS=""' onc https://github.com/cross-rs/cross/issues/1561 is resolved
+      run: RUSTFLAGS="" cargo install cross --git https://github.com/cross-rs/cross
 
     - name: Configure cross
       if: ${{ matrix.use-cross }}
@@ -138,6 +139,7 @@ jobs:
     - name: Build wasmtime library
       if: ${{ !matrix.use-cross && contains(matrix.features, 'wasm') }}
       run: |
+        mkdir -p target
         WASMTIME_VERSION=$(cargo metadata --format-version=1 --locked --features wasm | \
                            jq -r '.packages[] | select(.name == "wasmtime-c-api-impl") | .version')
         curl -LSs "$WASMTIME_REPO/archive/refs/tags/v${WASMTIME_VERSION}.tar.gz" | tar xzf - -C target