bug#26977: 25.2.50; RNC mode indentation is bad

[npostavs]

Ivan Andrus <darthandrus@gmail.com> writes:

> The patch below fixes it for me, but there is likely a better way to do
> it.  It relies on the fact that no token in RNC is more than one
> punctation character which seems somewhat coincidental, but is true
> as far as I know.

I think that's the right way to do it.  The RNC grammar has only single
character operators, and it makes sense that the tokenizer would make
use of this fact.