rename printrefs, getobjects to _Py_ prefix
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index c789881..1da9d9e 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -658,7 +658,7 @@
 
 #ifdef Py_TRACE_REFS
 	if (askyesno("Print left references?")) {
-		printrefs(stderr);
+		_Py_PrintReferences(stderr);
 	}
 #endif /* Py_TRACE_REFS */