Commits
François Saint-Jacques authored and Wes McKinney committed eb8bc60e749
ARROW-5010: [Release] Fix source release docker Gandiva was migrated to llvm-7, the source release script Dockerfile did not follow. Author: François Saint-Jacques <fsaintjacques@gmail.com> Closes #4031 from fsaintjacques/ARROW-5010-fix-release-docker and squashes the following commits: a6c2e8d75 <François Saint-Jacques> ARROW-5010: Fix source release docker