[BUILD] Evaluate build environment variables

[TheRedDaemon]

At the moment, the build.bat and the CMakePresets.json set various environment variables to trigger a build with the old compiler.
The modfied variables are extensive, but there are also variables that are still set by Visual Studio.

We might consider two possible approaches:

• Trying to reduce the set variables in length and number to a minimum.
• Trying to override as much as possible to avoid calls to newer systems.

This task is essentially optional, either meant to reduce clutter or improve precision.