Fixing the windows build

Signed-off-by: Matthew A Johnson <matjoh@microsoft.com>

Author: matajoh

PC/config.c

@@ -14,6 +14,7 @@ extern PyObject* PyInit_errno(void);
 extern PyObject* PyInit_faulthandler(void);
 extern PyObject* PyInit__tracemalloc(void);
 extern PyObject* PyInit_gc(void);
+extern PyObject* PyInit_immutable(void);
 extern PyObject* PyInit_math(void);
 extern PyObject* PyInit__md5(void);
 extern PyObject* PyInit_nt(void);
@@ -95,6 +96,7 @@ struct _inittab _PyImport_Inittab[] = {
     {"errno", PyInit_errno},
     {"faulthandler", PyInit_faulthandler},
     {"gc", PyInit_gc},
+    {"immutable", PyInit_immutable},
     {"math", PyInit_math},
     {"nt", PyInit_nt}, /* Use the NT os functions, not posix */
     {"_operator", PyInit__operator},

Python/immutability.c

@@ -382,7 +382,7 @@ typedef enum {
     VALID_IMPLICIT,
     INVALID_NOT_FREEZABLE,
     INVALID_C_EXTENSIONS,
-    ERROR
+    ERROR_FREEZE
 } FreezableCheck;
 
 
@@ -401,7 +401,7 @@ static FreezableCheck check_freezable(struct _Py_immutability_state *state, PyOb
     */
     result = PyObject_IsInstance(obj, (PyObject *)&_PyNotFreezable_Type);
     if(result == -1){
-        return ERROR;
+        return ERROR_FREEZE;
     }
     else if(result == 1){
         return INVALID_NOT_FREEZABLE;
@@ -413,7 +413,7 @@ static FreezableCheck check_freezable(struct _Py_immutability_state *state, PyOb
 
     result = is_explicitly_freezable(state, obj);
     if(result == -1){
-        return ERROR;
+        return ERROR_FREEZE;
     }
     else if(result == 1){
         return VALID_EXPLICIT;
@@ -519,7 +519,7 @@ int _PyImmutability_Freeze(PyObject* obj)
             case VALID_IMPLICIT:
                 break;
 
-            case ERROR:
+            case ERROR_FREEZE:
                 goto error;
 
             default: