Assign priority to CMAKE_FIND_ROOT_PATH list elements
https://cmake.org/cmake/help/latest/variable/CMAKE_FIND_ROOT_PATH.html is a "Semicolon-separated list of root paths to search on the filesystem". I suspect the searches are done in the order used when defining CMAKE_FIND_ROOT_PATH, but I'm not sure and in any case I don't want to rely on an undocumented property.
So it would be nice to guarantee the searches will never find something in the last element of CMAKE_FIND_ROOT_PATH if the same thing is also available in the first element.