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GH-41755: [C++][ORC] Ensure setting detected ORC version (#41767)

`FindorcAlt.cmake` doesn't set `orcAlt_VERSION` when it finds ORC by `find_library()`/`find_path()`. If `orcAlt_VERSION` isn't set, ORC version detection by caller is failed.

`cpp/src/arrow/adapters/orc/adapter.cc` uses detected ORC version. If detected ORC version isn't correct, needless time zone database check is used.

Deployed in conda-forge through https://github.com/conda-forge/arrow-cpp-feedstock/pull/1424 and confirmed as working in https://github.com/conda-forge/pyarrow-feedstock/pull/122
* GitHub Issue: #41755

Authored-by: H. Vetinari <h.vetinari@gmx.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>