centos-release-scl-rh has devtoolset-7 for ppc64le so we can use it instead of installing gcc from sources and shipping libstdc++.so from it. Don't really know why centos-release-scl doesn't have it for ppc64le.
This PR also unifies the build process for x86_64 and ppc64le.
centos-release-scl-rhhas devtoolset-7 for ppc64le so we can use it instead of installing gcc from sources and shippinglibstdc++.sofrom it. Don't really know whycentos-release-scldoesn't have it for ppc64le.This PR also unifies the build process for
x86_64andppc64le.