Bug#1089204: librust-lazy-regex-dev: Autopkgtest failure for --no-default-features

[noisycoil]

> Indeed I totally missed it.  And your proposed patch (if working, which
> I am testing right now, restructered to instead extend existing feature
> fencing patch) is more elegant than giving up and skipping the test.
>
Thanks and I agree, it could be worth it not to disable the test. This is the 
reason why I hadn't closed this bug myself in the first place.

> Thanks - also for shouting out now, and sorry for missing it previously,
>
No problem!