Compiling mongo-cxx-driver-r3.6.1

@Luke_Colias since you are using CentOS 8, you have two options. The gcc package shipped with RHEL 8 is version 8.3.1. Assuming that CentOS 8 has the same or a similar version, you can use the compiler C++17 support for your polyfill. If you prefer to use MNMLSTC, then you can download the MNMLSTC code from GitHub, build it and install it locally, and then direct the C++ driver build to use the already built/installed MNMLSTC rather than trying to build it itself. Note that the C++ driver build builds the MNMLSTC code from tag v1.1.0.

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