Fix build issues

Author: lysnikolaou

tornado/speedups.c

@@ -51,16 +51,21 @@ static PyObject* websocket_mask(PyObject* self, PyObject* args) {
     return result;
 }
 
+static int speedups_exec(PyObject *module) {
+    return 0;
+}
+
 static PyMethodDef methods[] = {
     {"websocket_mask",  websocket_mask, METH_VARARGS, ""},
     {NULL, NULL, 0, NULL}
 };
 
 static PyModuleDef_Slot slots[] = {
-#if PY_VERSION_HEX >= 0x030c0000
+    {Py_mod_exec, speedups_exec},
+#if (!defined(Py_LIMITED_API) && PY_VERSION_HEX >= 0x030c0000) || Py_LIMITED_API >= 0x030c0000
     {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
 #endif
-#if PY_VERSION_HEX >= 0x030d0000
+#if !defined(Py_LIMITED_API) && PY_VERSION_HEX >= 0x030d0000
     {Py_mod_gil, Py_MOD_GIL_NOT_USED},
 #endif
     {0, NULL}