Rename PyUnicode_AsString -> _PyUnicode_AsString and
PyUnicode_AsStringAndSize -> _PyUnicode_AsStringAndSize to mark
them for interpreter internal use only.

We'll have to rework these APIs or create new ones for the
purpose of accessing the UTF-8 representation of Unicode objects
for 3.1.
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 25b82b4..48318a8 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -1461,7 +1461,7 @@
 	return PyErr_Format(PyExc_TypeError,
 			    "RAND_egd() expected string, found %s",
 			    Py_TYPE(arg)->tp_name);
-    bytes = RAND_egd(PyUnicode_AsString(arg));
+    bytes = RAND_egd(_PyUnicode_AsString(arg));
     if (bytes == -1) {
 	PyErr_SetString(PySSLErrorObject,
 			"EGD connection failed or EGD did not return "