Does that patch fix the problem for you too?

I've fixed several warnings for overly long docstrings in automatically
generated strings.  If any remain, I would definitely like to find them
and fix them, so I appreciate your help in getting to the root of this.
Thanks.

BTW, if you find these warnings too much of a hassle, you could consider
disabling them with a directory local variable; I believe you would need
to set `byte-compile-warnings' to e.g. `(not docstrings)'.