Replace PyObject_Unicode with PyObject_Str everywhere, and remove the
#define for PyObject_Unicode in object.h.
diff --git a/Modules/grpmodule.c b/Modules/grpmodule.c
index 853f0f6..7e47925 100644
--- a/Modules/grpmodule.c
+++ b/Modules/grpmodule.c
@@ -110,7 +110,7 @@
     char *name;
     struct group *p;
 
-    py_str_name = PyObject_Unicode(pyo_name);
+    py_str_name = PyObject_Str(pyo_name);
     if (!py_str_name)
 	    return NULL;
     name = PyUnicode_AsString(py_str_name);