===Python API===

Define macros for Py_RETURN_TRUE and Py_RETURN_FALSE (for Python 2.3).  Also
make Py_RETURN_NONE macro a little safer.  Current macro will not work as
expected in situations like below since it expands to two C statements:

	if( !attr )
		Py_RETURN_NONE;

source/blender/python/api2_2x/gen_utils.h

@@ -50,7 +50,13 @@
    defined here until we switch to 2.4
 */
 #ifndef Py_RETURN_NONE
-#define Py_RETURN_NONE  Py_INCREF( Py_None ); return Py_None 
+#define Py_RETURN_NONE	return Py_BuildValue("O", Py_None)
+#endif
+#ifndef Py_RETURN_FALSE
+#define Py_RETURN_FALSE  return PyBool_FromLong(0) 
+#endif
+#ifndef Py_RETURN_TRUE
+#define Py_RETURN_TRUE  return PyBool_FromLong(1)
 #endif
 
 int EXPP_FloatsAreEqual(float A, float B, int floatSteps);