New fonts for building guide/ja/guide.pdf

These fonts actually work with fop-ttfreader, unlike the IPAex
fonts previously linked. These fonts can be distributed as well
as embedded, which the IPAex fonts could not.

Font metric files are also included in case fop is available but
fop-ttfreader isn't.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash-docs/trunk@23694 57a11ea4-9604-0410-9ed3-97b8803252fd