fix build when component-model-async feature disabled

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Author: dicej

crates/wasmtime/src/runtime/component/concurrent_disabled.rs

@@ -21,6 +21,10 @@ fn should_have_failed_validation<T>(what: &str) -> Result<T> {
     ))
 }
 
+pub(crate) fn check_blocking(_: &mut dyn VMStore) -> Result<()> {
+    Ok(())
+}
+
 pub(crate) fn poll_and_block<R: Send + Sync + 'static>(
     _store: &mut dyn VMStore,
     future: impl Future<Output = Result<R>> + Send + 'static,

crates/wasmtime/src/runtime/component/func/host.rs

@@ -51,8 +51,10 @@ impl FunctionStyle for SyncStyle {
     const ASYNC: bool = false;
 }
 
+#[cfg(feature = "component-model-async")]
 struct AsyncStyle;
 
+#[cfg(feature = "component-model-async")]
 impl FunctionStyle for AsyncStyle {
     const ASYNC: bool = true;
 }