Add orig_commit.

src/blame.c

@@ -269,7 +269,9 @@ static git_blame_hunk* hunk_from_entry(git_blame__entry *e)
 	git_blame_hunk *h = new_hunk(
 			e->lno+1, e->num_lines, e->s_lno+1, e->suspect->path);
 	git_oid_cpy(&h->final_commit_id, git_commit_id(e->suspect->commit));
+	git_oid_cpy(&h->orig_commit_id, git_commit_id(e->suspect->commit));
 	h->final_signature = git_signature_dup(git_commit_author(e->suspect->commit));
+	h->orig_signature = git_signature_dup(git_commit_author(e->suspect->commit));
 	h->boundary = e->is_boundary ? 1 : 0;
 	return h;
 }