Update gcc/g++ settings for PAX on RockyLinux 8 Cloudberry can now be built with PAX support using the default GCC/G++ toolchain on Rocky Linux 8. There is no longer a need to upgrade GCC/G++. The default GCC/G++ version on Rocky Linux 8 are: - gcc 8.5.0 - g++ 8.5.0 See PR: https://github.com/apache/cloudberry/pull/1165