[v3] enable check-abi summary

[Benjamin Kosnik]

>Thanks, I'll test this later today.  And will try to get 3.2.0
>baselines now for the other archs so that we can check whether we
>followed the abi.

All right, cool.

>> ! new-abi-baseline: 
>
>You need to mkdir the directory - I send a patch for this over the
>weekend.  Otherwise make check will fail since the directory does not
>exist.  Just remove your i486-linux baseline directory and rerun to
>see what happens.

Ok, I thought I caught all that email but apparently not. You can just
check in a patch for this if you can, please.

-benjamin