fix PyXXX_Length macros as suggested by Fred
diff --git a/Include/abstract.h b/Include/abstract.h
index d1a1db3..890ffcd 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -383,7 +383,7 @@
DL_IMPORT(int) PyObject_Size(PyObject *o);
-#define PyObject_Length(O) PyObject_Size((O))
+#define PyObject_Length PyObject_Size
/*
Return the size of object o. If the object, o, provides
@@ -685,7 +685,7 @@
DL_IMPORT(int) PySequence_Size(PyObject *o);
-#define PySequence_Length(O) PySequence_Size((O))
+#define PySequence_Length PySequence_Size
/*
Return the size of sequence object o, or -1 on failure.
@@ -839,7 +839,7 @@
DL_IMPORT(int) PyMapping_Size(PyObject *o);
-#define PyMapping_Length(O) PyMapping_Size((O))
+#define PyMapping_Length PyMapping_Size
/*
Returns the number of keys in object o on success, and -1 on