convert GST_*_PADDING to _gst_reserved[GST_PADDING];

Original commit message from CVS:
convert GST_*_PADDING to _gst_reserved[GST_PADDING];

libs/gst/bytestream/bytestream.h

@@ -48,7 +48,7 @@ struct _GstByteStream {
   /* if we are in the seek state (waiting for DISCONT) */
   gboolean	 in_seek;
 
-  GST_OBJECT_PADDING
+  gpointer _gst_reserved[GST_PADDING];
 };
 
 GstByteStream*		gst_bytestream_new		(GstPad *pad);