move Japanese output files to utf-8

1) build boostrap
2) svn mv *.html.ja.euc-jp *.html.ja.utf8
3) build all


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@643967 13f79535-47bb-0310-9956-ffa450edef68