Changing default cxx_stdlib to libc++

[db]

On 13 Mar 2018, at 17:10, Mojca Miklavec <mojca.miklavec.lists at gmail.com> wrote:
> The main problem is that Travis is *not* out main build system, we use
> a different system for that. Travis has lots of limitations:

Got it. Then why use it in the first place instead of an alternative CI?