Commits
Antoine Pitrou authored 1c85e41e324
ARROW-3492: [C++] Build jemalloc in parallel Author: Antoine Pitrou <antoine@python.org> Closes #2745 from pitrou/ARROW-3492-jemalloc-parallel-build and squashes the following commits: 2c000040 <Antoine Pitrou> ARROW-3492: Build jemalloc in parallel