Output a big warning if somebody actually has a pre-1.0 version
of svn that doesn't support it.
Thanks to Yann Dirson for reminding me it still existed
and attempting to re-enable it :)
I think I subconciously removed support for it earlier...
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>
7317ed906a