completion: use __gitcomp_builtin in _git_difftool
Since we can't automatically extract diff options for completion yet, difftool will take all options from $__git_diff_common_options. This brings _a lot_ more completable options to difftool. --ignore-submodules is added to $__git_diff_common_options to avoid regression in difftool. But it's a good thing anyway even for other diff commands. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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