Avoid update hook during git-rebase --interactive

If we are rebasing changes that contain potential whitespace errors that our .git/hooks/pre-commit hook looks for and fails on then git-commit will fail to commit that change. This causes git-rebase--interactive to squash commits together, even though it was not requested to do so by the todo file. Passing --no-verify to git-commit makes git-rebase -i behave more like git-rebase normally would in such conditions, providing more consistent behavior between the different rebase implementations. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>