liburing: Fix references between outputs issue
liburing: Fix references between outputs issue

Experienced in:
https://github.com/NixOS/nixpkgs/pull/98869#discussion_r495492213

Set configure flags properly, don't override configurePhase, per:
https://github.com/jtojnar/nixpkgs-hammering/blob/master/explanations/explicit-phases.md

Use different output names - use $bin for examples, and $out for
libraries which expectedly should be referenced by reverse deps.

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