Implement empty stubs if needed instead of empty static inline git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31617 a1c6a512-1295-4272-9138-f99709370657
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20226 a1c6a512-1295-4272-9138-f99709370657