wasm: support rt-multi-thread with wasm32-wasi-preview1-threads (#6510)

tests-integration/tests/macros_main.rs

@@ -1,8 +1,4 @@
-#![cfg(all(
-    feature = "macros",
-    feature = "rt-multi-thread",
-    not(target_os = "wasi")
-))]
+#![cfg(all(feature = "macros", feature = "rt-multi-thread"))]
 
 #[tokio::main]
 async fn basic_main() -> usize {

tests-integration/tests/macros_select.rs

@@ -4,7 +4,10 @@ use futures::channel::oneshot;
 use futures::executor::block_on;
 use std::thread;
 
-#[cfg_attr(target_os = "wasi", ignore = "WASI: std::thread::spawn not supported")]
+#[cfg_attr(
+    not(feature = "rt-multi-thread"),
+    ignore = "WASI: std::thread::spawn not supported"
+)]
 #[test]
 fn join_with_select() {
     block_on(async {