Make functions that should be public references external

[jmccl]

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git request-pull output:

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Generate your PR shortlog and diffstat with these commands:
   git remote add axboe-tree https://github.com/axboe/liburing
   git fetch axboe-tree
   git request-pull axboe-tree/master your_fork_URL your_branch_name

Then replace this with the output of `git request-pull` command.

<!-- END REPLACE ME -->

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src/queue: don't flush SQ ring for new wait interface

If we have IORING_FEAT_EXT_ARG, then timeouts are done through the
syscall instead of by posting an internal timeout. This was done
to be both more efficient, but also to enable multi-threaded use
the wait side. If we touch the SQ state by flushing it, that isn't
safe without synchronization.

Fixes: https://github.com/axboe/liburing/issues/402
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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[ammarfaizi2]

From: jmccl <5283750+jmccl@users.noreply.github.com>

Don't use your GitHub username and your GitHub anonymous email.

Follow the pull request guidelines, please.