server: fix 32-bit build warning

Cast the 64-bit tag to a 32-bit pointer first, before
casting to the fio_net_cmd_reply pointer.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
android: add shm syscalls and fix ioprio definitions

Signed-off-by: Jens Axboe <axboe@kernel.dk>