fix eina_prefix.c on Windows (at least a part of it, as elm is not working with it)
fix eina_prefix.c on Windows (at least a part of it, as elm is not working with it)

git-svn-id: a6113611d365f0fc061992be0d1d0b451b434026@59454 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

jordemort/eina,jordemort/eina,jordemort/eina