Call PyUnstable_Module_SetGIL for main and test extensions for no-GIL interpreters

Author: clin1234

src/greenlet/greenlet.cpp

@@ -213,6 +213,10 @@ greenlet_internal_mod_init() noexcept
     try {
         CreatedModule m(greenlet_module_def);
 
+#ifdef Py_GIL_DISABLED
+        PyUnstable_Module_SetGIL(m.borrow(), Py_MOD_GIL_NOT_USED);
+#endif
+
         Require(PyType_Ready(&PyGreenlet_Type));
         Require(PyType_Ready(&PyGreenletUnswitchable_Type));
 

src/greenlet/tests/_test_extension_cpp.cpp

@@ -221,6 +221,10 @@ PyInit__test_extension_cpp(void)
     p_test_exception_throw_nonstd = test_exception_throw_nonstd;
     p_test_exception_throw_std = test_exception_throw_std;
     p_test_exception_switch_recurse = test_exception_switch_recurse;
+#ifdef Py_GIL_DISABLED
+    PyUnstable_Module_SetGIL(module, Py_MOD_GIL_NOT_USED);
+#endif
+
 #ifdef Py_GIL_DISABLED
     PyUnstable_Module_SetGIL(module, Py_MOD_GIL_NOT_USED);
 #endif