Let valgrind help with EINA_MAGIC.

Let valgrind help with EINA_MAGIC.

Keep EINA_MAGIC at the end of the structure (WHEN POSSIBLE! Watch out
flexible arrays like char str[] at the end!)

this way if parts use EINA_MAGIC and others do not, it will possible overflow and valgrind can help us.

WARNING: make uninstall before update! Then make clean and make install, check if everything is working with "make check".

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/eina@37961 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33