[vorbis-dev] ao hard codes -ldl in configure tests

[Timothy J. Wood]

  In my opinion, using dlopen in libao was a bad choice in the first place.  Loadable modules make sense in a few cases:

- When you don't want to release source to the code doing the loading but still want to allow users to extend it.  Obviously not a concern here.
- When there are zillions of potential plugins (image filters, for example).  Obviously not a concern here.
- When it is too difficult/time consuming/costly for the average developer to build the system that would do the loading.  Also obviously not a concern here.

  libao is a _tiny_ piece of code that really does very little and is just being needlessly complicated by the dlopen() usage.  If I had to guess, I'd say that someone was interested in learning dlopen() and choose to do it here, but I think this is a bad design decision given the criteria above.

  This ended up making the code less portable with out much benefit that I see.

-tim

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