fstrm: my_queue API change
fstrm: my_queue API change

the my_queue API has been changed to allow arbitrarily sized queue
element sizes, which allows elimination of the malloc() in
fstrm_io_submit() and corresponding free() when the queue entry is
consumed, at the expense of requiring more memory to be allocated up
front.

farsightsec/fstrm,farsightsec/fstrm