[Bug other/92484] In tree build of ISL 0.22 fails: requires C++11

[romain.geissler at amadeus dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92484

--- Comment #2 from Romain Geissler <romain.geissler at amadeus dot com> ---
Yes this is what I did, I reverted back to ISL 0.21 which for me has been
working for the past months (don't know if it's a recommanded version though).

Shall we keep this bug open to track the upcoming support of in-tree 0.22 or
shall it be closed ?