Change the way the MAX_FILETYPES define works. It now allocates enough filetype icons as it needed last boot + 8, this means we should never have to edit the define again.
If you get the "filetypes array full" splash, do a clean reboot and it shuold go away. if it doesnt make sure you file a bug report and let us know you did reboot and it stayed there... it means that define does actually need increeasing.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14287 a1c6a512-1295-4272-9138-f99709370657