Don't build str(n)casecmp as functions if they are already defined by preprocessor git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31147 a1c6a512-1295-4272-9138-f99709370657
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24542 a1c6a512-1295-4272-9138-f99709370657
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1057 a1c6a512-1295-4272-9138-f99709370657