[Dune] g++ support

[Christoph Grüninger]

Hi Andreas,
Probably an outdated CI config. Since https://gitlab.dune-project.org/core/dune-common/-/merge_requests/786 it works for me. I rebased and force-pushed my branch and all went green.

Bye
Christoph

> Am 19.03.2020 um 18:40 schrieb Dedner, Andreas <A.S.Dedner at warwick.ac.uk>:
> 
> Hi.
> Hope you are all well...
> 
> I wanted to check, what the required g++ version now is?
> In dune-common/README.md it says >=7 but for a few days now std::optinal is used in dune-common and that seems to fail with 7.3
> which is the compiler our CI in Stuttgart is using with the Debian 10
> image.
> Best
> Andreas
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