t9159 relies on the command-line syntax of svn >= 1.5. Given the
declining install base of older svn versions, it is not worth our time to
support older svn syntax.
Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Acked-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>