t0008: 4 tests fail with ksh88

In t0008, we have cat <<-EOF ... a/b/.gitignore:8:!on* "a/b/one\"three" ... EOF and expect that the backslash-dq is passed through literally. ksh88 eats the backslash and produces a wrong expect file to compare the actual output with. Using \\" works this around without breaking other POSIX shells (which collapse backslash-backslash to a single backslash), and ksh88 does so, too. It makes it easier to read, too, because the reason why we are writing backslash there is *not* because we think dq is special and want to quote it (if that were the case we would have two more backslashes on that line). It is simply because we want a single literal backslash there. Since backslash is treated specially in unquoted here-document, explicitly doubling it to quote it expresses our intent better than relying on the character that immediately comes after it (i.e. '"') not being a special character. Signed-off-by: Armin Kunaschik <megabreit@googlemail.com> Acked-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>