Fix wamrapi python binding for darwin (bytecodealliance#1978)

Author: yamt

language-bindings/python/pyproject.toml

@@ -1,3 +1,3 @@
 [build-system]
-requires = ["setuptools>=42"]
+requires = ["setuptools>=42", "ctypesgen==1.1.1"]
 build-backend = "setuptools.build_meta"