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Sutou Kouhei authored and GitHub committed 8a644afc77e
GH-39136: [C++] Remove needless system Protobuf dependency with -DARROW_HDFS=ON (#39137) ### Rationale for this change Our HDFS related codes don't depend on Protobuf because we process HDFS via external `libhdfs.so` and it's `dlopen()`-ed. ### What changes are included in this PR? Remove a needless CMake configuration. ### Are these changes tested? Yes. ### Are there any user-facing changes? Yes. * Closes: #39136 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>