Commits
Uwe L. Korn authored and Wes McKinney committed 655eb74e7a2
ARROW-2212: [C++/Python] Build Protobuf in base manylinux 1 docker image Saves ~6min build time. Author: Uwe L. Korn <uwelk@xhochy.com> Closes #1662 from xhochy/ARROW-2212 and squashes the following commits: acf2319d <Uwe L. Korn> ARROW-2212: Build Protobuf in base manylinux1 docker image