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GH-34188: [C++][Benchmark] Add missing BENCHMARK_STATIC_DEFINE for bundled gbenchmark (#34194)

### Rationale for this change

We need to specify `-DBENCHMARK_STATIC_DEFINE` to use gbenchmark as a static library since gbenchmark 1.6.2.

### What changes are included in this PR?

This change specifies `BENCHMARK_STATIC_DEFINE` for bundled gbenchmark explicitly.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #34188

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