Update isl to 0.16.1?

[Achim Gratz]

Yaakov Selkowitz writes:
>>> If you've confirmed that this is the exact version gcc6 needs, then yes.
>>> Alternatively, Jon could take over the package to sync with any gcc
>>> updates, since I believe gcc is the only user anyway.
>
> Ping?

Are you pinging me or JonY?  If you meant me, just confirm the exact
version and I'll see what there is to do.  It would also be helpful to
figure out which other versions we need to keep for the older gcc
packages.


Regards,
Achim.
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