setup.py: also use swig-4.3.1 with pyodide.

swig-4.4.0 breaks pyodide similarly to macos.

Author: julian-smith-artifex-com

setup.py

@@ -1412,8 +1412,9 @@ def platform_release_tuple():
             print(f'OpenBSD: pip install of swig does not build; assuming `pkg_add swig`.')
         elif PYMUPDF_SETUP_SWIG:
             pass
-        elif darwin:
-            # 2025-10-27: new swig-4.4.0 fails badly at runtime.
+        elif darwin or os.environ.get('PYODIDE_ROOT'):
+            # 2025-10-27: new swig-4.4.0 fails badly at runtime on macos.
+            # 2025-11-06: similar for pyodide.
             ret.append('swig==4.3.1')
         else:
             ret.append('swig')