Hard-code the location for the WASI SDK for the non-debug WASI workers (#651)

Only run on Python 3.11 and 3.12 with WASI SDK 21. Hard-coding allows for symlinking `/opt/wasi-sdk` to WASI SDK 24 for Python 3.13. For Python 3.14 and later this is not a concern as `Tools/wasm/wasi` find the appropriate WASI SDK automatically in `/opt`.

Author: brettcannon

master/custom/factories.py

@@ -889,7 +889,7 @@ def setup(self, parallel, branch, test_with_PTY=False, **kwargs):
 class Wasm32WasiCrossBuild(UnixCrossBuild):
     """wasm32-wasi builder
 
-    * WASI SDK >= 16 must be installed to default path /opt/wasi-sdk
+    * WASI SDK 21 must be installed at /opt/wasi-sdk-21.0
     * wasmtime must be installed and on PATH
     """
 
@@ -924,6 +924,7 @@ def setup(self, parallel, branch, test_with_PTY=False, **kwargs):
                 haltOnFailure=True,
             )
         )
+        self.compile_environ["WASI_SDK_PATH"] = "/opt/wasi-sdk-21.0"
         super().setup(parallel, branch, test_with_PTY=test_with_PTY, **kwargs)