NSTRACE: Create message indicating window and/or buffer.

[Keith David Bershatsky]

I would like to insert a NSTRACE message to let me know the window and/or 
buffer at issue.

For example, ns_update_window_end contains a first argument of `w`.  I would 
like to see the pretty human readable name for that window, just like what we 
see when running `M-x trace-redisplay`.  The `%s` format argument requires a 
`char`, and rejects a Lisp_Object.

How can I achieve this feature?

Thanks,

Keith