Revert "Base debug on Py_REF_DEBUG"

This reverts commit 86f2a01.

Author: zklaus

Lib/test/test_sys.py

@@ -747,7 +747,7 @@ def test_abi_info(self):
         self.assertEqual(info.byteorder, sys.byteorder)
         for attr, flag in [
             ("free_threaded", "Py_GIL_DISABLED"),
-            ("debug", "Py_REF_DEBUG"),
+            ("debug", "Py_DEBUG"),
         ]:
             self.assertEqual(getattr(info, attr, None),
                              bool(sysconfig.get_config_var(flag)),

Python/sysmodule.c

@@ -3670,7 +3670,7 @@ make_abi_info(void)
         goto error;
     }
 
-#ifdef Py_REF_DEBUG
+#ifdef Py_DEBUG
     value = Py_True;
 #else
     value = Py_False;