Fixed "fetch" behavior for git v2.21, per https://apple.stackexchange.com/questions/352404/git-clone-fails-with-fatal-multiple-updates-for-ref-refs-tags-v1-0-0-not-all
Fixed "fetch" behavior for git v2.21, per
https://apple.stackexchange.com/questions/352404/git-clone-fails-with-fatal-multiple-updates-for-ref-refs-tags-v1-0-0-not-all

robraft/robraft,robraft/robraft,robraft/robraft