Beta Branch update prep for ModSecurity v3.0 part 2

update prep for ModSecurity v3.0 part 2

- ModSecurity-nginx connector module requires newer GCC compiler so force it to use GCC 6.2.1+ from devtoolset-6 when NGINX_MODSECURITY='y' is set

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123.09beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/123.09beta01
• Commit History: https://github.com/centminmod/centminmod/commits/123.09beta01