bpo-32381: Add _PyRun_SimpleFileObject() (GH-23709)

pymain_run_startup() now pass the filename as a Python object to
_PyRun_SimpleFileObject().
diff --git a/Include/cpython/pythonrun.h b/Include/cpython/pythonrun.h
index 4945d92..febda73 100644
--- a/Include/cpython/pythonrun.h
+++ b/Include/cpython/pythonrun.h
@@ -3,6 +3,11 @@
 #endif
 
 PyAPI_FUNC(int) PyRun_SimpleStringFlags(const char *, PyCompilerFlags *);
+PyAPI_FUNC(int) _PyRun_SimpleFileObject(
+    FILE *fp,
+    PyObject *filename,
+    int closeit,
+    PyCompilerFlags *flags);
 PyAPI_FUNC(int) PyRun_AnyFileExFlags(
     FILE *fp,
     const char *filename,       /* decoded from the filesystem encoding */