CentOS 6 builds failing due to cmake3 yum install error

[fredrikaverpil]

https://travis-ci.org/fredrikaverpil/pyside2-wheels/jobs/262530743#L1597

Error: Package: cmake3-3.6.1-2.el6.x86_64 (epel)
           Requires: libarchive.so.13()(64bit)
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest
The command '/bin/sh -c yum install -y epel-release &&     yum install -y deltarpm &&     yum install -y centos-release-SCL &&     yum install -y python python-libs python-devel python-pip &&     yum groupinstall "Development Tools" -y &&     yum install -y libxslt libxml2 libxml2-devel libxslt-devel cmake3 openssl &&     yum install -y qt5-qtbase-devel &&     yum install -y --skip-broken qt5*' returned a non-zero code: 1

[fredrikaverpil]

Fixed.