git-svn: remove any need for the XML::Simple dependency
XML::Simple was originally required back when I made svn-arch-mirror
because I needed to explictly track renames with Arch. Then I carried
it over to git-svn because I was afraid somebody could commit an svn
log message that could throw off a non-XML log parser. Then I noticed
the <n> lines column in the header. So, no more XML :)
Signed-off-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Junio C Hamano <junkio@cox.net>