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/Objects/structseq.c b/Objects/structseq.c
index c348254..b6126ba 100644
--- a/Objects/structseq.c
+++ b/Objects/structseq.c
@@ -270,7 +270,7 @@
 			Py_DECREF(tup);
 			return NULL;
 		}
-		crepr = PyBytes_AsString(repr);
+		crepr = PyString_AsString(repr);
 		if (crepr == NULL) {
 			Py_DECREF(tup);
 			Py_DECREF(repr);
@@ -306,7 +306,7 @@
 	*pbuf++ = ')';
 	*pbuf = '\0';
 
-	return PyBytes_FromString(buf);
+	return PyString_FromString(buf);
 }
 
 static PyObject *