Merge branch 'ab/drop-scripted-rebase'

Retire scripted "git rebase" implementation. * ab/drop-scripted-rebase: rebase: remove the rebase.useBuiltin setting

Junio C Hamano committed Apr 16, 2019 at 19:28 UTC 4f3036cfa1ffe2470f1afafe541fea8d58d9282b

No changes.