setup.py: use latest swig on macos.

Author: julian-smith-artifex-com

setup.py

@@ -1443,10 +1443,10 @@ 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 or os.environ.get('PYODIDE_ROOT'):
+        elif 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.
-            # 2026-02-24: Stil fails badly on macos with swig 4.4.1.
+            # 2026-02-24: Appears to work on macos with swig 4.4.1.
             ret.append('swig==4.3.1')
         else:
             ret.append('swig')