Correct error to PyRun_SimpleString macro introduced in AST merge.

Include/pythonrun.h

@@ -82,7 +82,7 @@ PyAPI_FUNC(int) Py_Main(int argc, char **argv);
 	PyRun_AnyFileExFlags(fp, name, closeit, NULL)
 #define PyRun_AnyFileFlags(fp, name, flags) \
 	PyRun_AnyFileExFlags(fp, name, 0, flags)
-#define PyRun_SimpleString(s, f) PyRunSimpleStringFlags(s, f, NULL)
+#define PyRun_SimpleString(s) PyRun_SimpleStringFlags(s, NULL)
 #define PyRun_SimpleFile(f, p) PyRun_SimpleFileExFlags(f, p, 0, NULL)
 #define PyRun_SimpleFileEx(f, p, c) PyRun_SimpleFileExFlags(f, p, c, NULL)
 #define PyRun_InteractiveOne(f, p) PyRun_InteractiveOneFlags(f, p, NULL)