Merge branch 'sg/completion-updates'

* sg/completion-updates:
  Revert "completion: don't declare 'local words' to make zsh happy"
  git-completion: fix regression in zsh support
  completion: move private shopt shim for zsh to __git_ namespace
  completion: don't declare 'local words' to make zsh happy

diff --cc contrib/completion/git-completion.bash
Simple merge