* New variants:
- `tmvz-cpu`
- `tmvz-gpu`
- `tmvz-pymva`
- `tmvz-sofie`
* Improve X-related dependencies.
* Improve TMVA-related dependencies with more specificity.
* Patch possible missing standard header include in Eve7.
* Patch Protobuf handling to support new Protobuf-provided CMake config
files required to handle transitive `abseil-cpp` dependence.
* Add missing terminal newline to `webgui` patch to remove patch
warning.
* Handle deprecated/removed build options.
* Handle unwanted system paths in various `PATH`-like environment
variables.
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