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GH-42149: [C++] Use FetchContent for bundled ORC (#43011)

### Rationale for this change

This also has a workaround for https://issues.apache.org/jira/browse/ORC-1732 .

### What changes are included in this PR?

ORC 2.0.1 has a dependency detection problem. We can't override the detection with ExternalProject but can override the detection with FetchContent.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.
* GitHub Issue: #42149

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>