This reverts r63675 based on the discussion in this thread:

 http://mail.python.org/pipermail/python-dev/2008-June/079988.html

Python 2.6 should stick with PyString_* in its codebase.  The PyBytes_* names
in the spirit of 3.0 are available via a #define only.  See the email thread.
diff --git a/Include/stringobject.h b/Include/stringobject.h
index e1cc17f..a50792c 100644
--- a/Include/stringobject.h
+++ b/Include/stringobject.h
@@ -1,13 +1,12 @@
 #define PyBytesObject PyStringObject
 #define PyBytes_Type PyString_Type
 
-#define PyString_Check PyBytes_Check
-#define PyString_CheckExact PyBytes_CheckExact
-#define PyString_CHECK_INTERNED PyBytes_CHECK_INTERNED
-#define PyString_AS_STRING PyBytes_AS_STRING
-#define PyString_GET_SIZE PyBytes_GET_SIZE
-
-#define Py_TPFLAGS_STRING_SUBCLASS Py_TPFLAGS_BYTES_SUBCLASS
+#define PyBytes_Check PyString_Check
+#define PyBytes_CheckExact PyString_CheckExact 
+#define PyBytes_CHECK_INTERNED PyString_CHECK_INTERNED
+#define PyBytes_AS_STRING PyString_AS_STRING
+#define PyBytes_GET_SIZE PyString_GET_SIZE
+#define Py_TPFLAGS_BYTES_SUBCLASS Py_TPFLAGS_STRING_SUBCLASS
 
 #define PyBytes_FromStringAndSize PyString_FromStringAndSize
 #define PyBytes_FromString PyString_FromString
@@ -23,9 +22,6 @@
 #define PyBytes_Format PyString_Format
 #define _PyBytes_FormatLong _PyString_FormatLong
 #define PyBytes_DecodeEscape PyString_DecodeEscape
-#define PyBytes_InternInPlace PyString_InternInPlace
-#define PyBytes_InternImmortal PyString_InternImmortal
-#define PyBytes_InternFromString PyString_InternFromString
 #define _PyBytes_Join _PyString_Join
 #define PyBytes_Decode PyString_Decode
 #define PyBytes_Encode PyString_Encode