manual: rockboy isn't built on all lcd bitmap targets

ideally we should check pixelformat and lcd height/depth but I don't
know how to do comparisons in tex (nor if it is possible at all)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27507 a1c6a512-1295-4272-9138-f99709370657
1 file changed