Really fix the BSD build this time

struct aioinit isn't defined on BSD it appears so we need to guard everything
in an #if defined(__linux__).

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5325 c046a42c-6fe2-441c-8c8c-71466251a162
