osx: fix deadlock on exit with libmpv on OSX

There is explicit code to handle the libmpv case, but it expects that
a dispatch queue is running. This is not necessarily the case. E.g.
edit the simple.c mpv example not to do any playback and to destroy
the mpv handle immediately. It will freeze on exit, because nothing
will release the mpv_handle.

I'm not sure how this should be fixed, so disable it for now in
library mode.

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