Use devtoolset-8 for building on RHEL/CentOS 6 & 7
protobuf 3.11+ does not compile with GCC 4.8.5 available from stock RHEL/CentOS 7 packages. RHEL/CentOS 6 faced a similar issue after protobuf version was bumped to 3.6 and the solution was to use devtoolset-7 on that operating system. Since devtoolset-8 is the latest C toolchain SCL available for both RHEL/CentOS 6 and RHEL/CentOS 7, use it for building protobuf on those operating systems.
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