t / t8005 / euc-japan.txton commit tree-diff: convert diff_root_tree_sha1() to just call diff_tree_sha1 with old=NULL (0b707c3)
   1EUC_JAPAN_NAME="»³ÅÄ ÂÀϺ"
   2EUC_JAPAN_MSG="¥Ö¥ì¡¼¥à¤Î¥Æ¥¹¥È¤Ç¤¹¡£"