Update CEnumType.c_code_cache_version().

theano/gof/type.py

@@ -1190,4 +1190,6 @@ class CEnumType(EnumList):
                    fail=sub['fail'])
 
     def c_code_cache_version(self):
-        return (1, super(CEnumType, self).c_code_cache_version())
+        # C code depends on (C constant name, Python value) associations (given by `self.items()`),
+        # so we should better take them into account in C code version.
+        return (1, tuple(self.items()), super(CEnumType, self).c_code_cache_version())