Don't use xcode toolchain for caroline

5 jobs for master
Status Job ID Name Coverage
  Test
passed #3815
autoscale-linux
linux

00:03:31

passed #3813
xc7 openswift atbuild
osx

00:00:05

passed #3814
xc7 openswift atbuild
osxxcode

00:00:04

 
  Package
passed #3819
xc7 openswift atbuild package-framework
ioscorepackage

00:00:02

passed #3818
xc7 openswift atbuild package-framework
osxcorepackage

00:00:03