Backported PyCapsule from 3.1, and converted most uses of
CObject to PyCapsule.
diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
index 552dae5..ede57cb 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -1261,7 +1261,7 @@
         PyModule_AddObject(m, "ucd_3_2_0", v);
 
     /* Export C API */
-    v = PyCObject_FromVoidPtr((void *) &hashAPI, NULL);
+    v = PyCapsule_New((void *)&hashAPI, PyUnicodeData_CAPSULE_NAME, NULL);
     if (v != NULL)
         PyModule_AddObject(m, "ucnhash_CAPI", v);
 }