Add declarations for PySys_ResetWarnOptions() and
PySys_AddWarnOption().
diff --git a/Include/sysmodule.h b/Include/sysmodule.h
index ca3aff7..92f2207 100644
--- a/Include/sysmodule.h
+++ b/Include/sysmodule.h
@@ -19,6 +19,9 @@
 extern DL_IMPORT(PyObject *) _PySys_TraceFunc, *_PySys_ProfileFunc;
 extern DL_IMPORT(int) _PySys_CheckInterval;
 
+DL_IMPORT(void) PySys_ResetWarnOptions(void);
+DL_IMPORT(void) PySys_AddWarnOption(char *);
+
 #ifdef __cplusplus
 }
 #endif