Issue #5748: bytesobject.c should not have its own private defines for stringlib macros. Also removed unused defines and include for localutil.h.
diff --git a/Objects/stringlib/unicodedefs.h b/Objects/stringlib/unicodedefs.h
index 366acfe..c23c392 100644
--- a/Objects/stringlib/unicodedefs.h
+++ b/Objects/stringlib/unicodedefs.h
@@ -21,6 +21,7 @@
 #define STRINGLIB_NEW            PyUnicode_FromUnicode
 #define STRINGLIB_RESIZE         PyUnicode_Resize
 #define STRINGLIB_CHECK          PyUnicode_Check
+#define STRINGLIB_CHECK_EXACT    PyUnicode_CheckExact
 #define STRINGLIB_GROUPING       _PyUnicode_InsertThousandsGrouping
 #define STRINGLIB_GROUPING_LOCALE _PyUnicode_InsertThousandsGroupingLocale