t/dedupe: remove leftover linux/fs.h include

Signed-off-by: Jens Axboe <axboe@fb.com>
t/dedupe: use fio abstracted OS_O_DIRECT

Signed-off-by: Jens Axboe <axboe@fb.com>
Ignore lexer.h auto-generated file

Signed-off-by: Jens Axboe <axboe@fb.com>
exp: fix issues around int vs size_t

This seems to be the easiest way - just wrap the call in a
macro that always passes a size_t, then it doesn't matter what
yy_n_chars is typed as (int or size_t).

Signed-off-by: Jens Axboe <axboe@fb.com>
exp: small code cleanup

Signed-off-by: Jens Axboe <axboe@fb.com>