Don't fail integration tests if the subject is not passing its own tests

[nrc]

As suggested in #2715 (comment)

[gnzlbg]

@nrc which project was failing its own tests?

[nrc]

which project was failing its own tests?

stdsimd was before, but I don't think it is now. In practice any of them could be, I think.

[gnzlbg]

Agreed, stdsimd is probably the most common one because as a component of std that requires compiler support, some changes to the compiler that break it take a bit to get propagated down to stdsimd.