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Korn, Uwe authored and Wes McKinney committed 3b959a32376
ARROW-4898: [C++] Old versions of FindProtobuf.cmake use ALL-CAPS for variables Author: Korn, Uwe <Uwe.Korn@blue-yonder.com> Closes #3919 from xhochy/ARROW-4898 and squashes the following commits: dea6b6f95 <Korn, Uwe> ARROW-4898: Old versions of FindProtobuf.cmake use ALL-CAPS for variables