[3.14] Being more flexible in when not to explicitly set the sysroot when compiling for WASI (GH-142242) (GH-142246)

Being more flexible in when not to explicitly set the sysroot when compiling for WASI (GH-142242)
(cherry picked from commit c525204)

Co-authored-by: Brett Cannon <[email protected]>

Author: miss-islington

Tools/wasm/wasi/__main__.py

@@ -269,7 +269,7 @@ def wasi_sdk_env(context):
     for env_var, binary_name in list(env.items()):
         env[env_var] = os.fsdecode(wasi_sdk_path / "bin" / binary_name)
 
-    if wasi_sdk_path != pathlib.Path("/opt/wasi-sdk"):
+    if not wasi_sdk_path.name.startswith("wasi-sdk"):
         for compiler in ["CC", "CPP", "CXX"]:
             env[compiler] += f" --sysroot={sysroot}"