[poppler] Increasing the C++ standard to C++17

[Albert Astals Cid]

El dilluns, 27 de setembre de 2021, a les 10:41:03 (CET), Valerio Messina va escriure:
> On 9/27/21 6:52 AM, William Bader wrote:
> > although would a distribution with an old gcc (I think 
> > that -std=gnu++17 was added in gcc 9, released May 2019) push anything 
> > but bug fixes for packages?
> 
> Debian 10 has gcc 8.3.0

Our CI has gcc 7.5 and it has compiled fine so I've went ahead with the increase.

Cheers,
  Albert

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