Issue #9599: Create PySys_FormatStdout() and PySys_FormatStderr()

Write a message formatted by PyUnicode_FromFormatV() to sys.stdout and
sys.stderr.
diff --git a/Include/sysmodule.h b/Include/sysmodule.h
index 786d46a..e43f378 100644
--- a/Include/sysmodule.h
+++ b/Include/sysmodule.h
@@ -14,9 +14,11 @@
 PyAPI_FUNC(void) PySys_SetPath(const wchar_t *);
 
 PyAPI_FUNC(void) PySys_WriteStdout(const char *format, ...)
-			Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
+                 Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
 PyAPI_FUNC(void) PySys_WriteStderr(const char *format, ...)
-			Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
+                 Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
+PyAPI_FUNC(void) PySys_FormatStdout(const char *format, ...);
+PyAPI_FUNC(void) PySys_FormatStderr(const char *format, ...);
 
 PyAPI_DATA(PyObject *) _PySys_TraceFunc, *_PySys_ProfileFunc;