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/Python/modsupport.c b/Python/modsupport.c
index b23749f..d54158f 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -65,7 +65,7 @@
 		return NULL;
 	d = PyModule_GetDict(m);
 	if (methods != NULL) {
-		n = PyBytes_FromString(name);
+		n = PyString_FromString(name);
 		if (n == NULL)
 			return NULL;
 		for (ml = methods; ml->ml_name != NULL; ml++) {
@@ -92,7 +92,7 @@
 		Py_DECREF(n);
 	}
 	if (doc != NULL) {
-		v = PyBytes_FromString(doc);
+		v = PyString_FromString(doc);
 		if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {
 			Py_XDECREF(v);
 			return NULL;
@@ -391,7 +391,7 @@
 		{
 			char p[1];
 			p[0] = (char)va_arg(*p_va, int);
-			return PyBytes_FromStringAndSize(p, 1);
+			return PyString_FromStringAndSize(p, 1);
 		}
 
 		case 's':
@@ -423,7 +423,7 @@
 					}
 					n = (Py_ssize_t)m;
 				}
-				v = PyBytes_FromStringAndSize(str, n);
+				v = PyString_FromStringAndSize(str, n);
 			}
 			return v;
 		}
@@ -633,7 +633,7 @@
 int 
 PyModule_AddStringConstant(PyObject *m, const char *name, const char *value)
 {
-	PyObject *o = PyBytes_FromString(value);
+	PyObject *o = PyString_FromString(value);
 	if (!o)
 		return -1;
 	if (PyModule_AddObject(m, name, o) == 0)