[Development] Upgrade the XCode running in the CI's macOS 10.11

[Thiago Macieira]

On Wednesday, 11 July 2018 15:13:00 PDT Tor Arne Vestbø wrote:
> I would love to drop any Xcode except the latest, but unfortunately our CI
> isn’t set up to build once (against latest SDK/Xcode) and then run tests on
> older macOS versions. Removing Xcode 8.2 effectively removes 10.11 testing.
> Seeing as we’re not building/testing on 10.13 (the latest macOS release),
> or 10.14 (the upcoming release), that would leave us with 10.12 as the
> single build/test target for macOS.

Ok, I've found a workaround to the issue meanwhile.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center