breaks 64bit archs (like simulators) but also doing >8 bit reads from memory
addresses with assumptions on alignment without that being really sure seems a
bit error-prone too. So we use memcmp() to compare 4 bytes strings...
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18356 a1c6a512-1295-4272-9138-f99709370657