[mlpack-git] [mlpack/mlpack] switch last (!) remaining std::cout to destination (#814)

[Dirk Eddelbuettel]

so I looked into why R was complaining that `std::cout` was referenced when linking against mlpack -- and it turns out that the (sole !!) remaining use of `std::cout` appears to be an instance that ought to have been converted to `destination`

this pr does that

no Travis build on my site; I just used to have a clone rather than fork and did not have Travis set up to build when I just committed this but it should work out just fine
You can view, comment on, or merge this pull request online at:

  https://github.com/mlpack/mlpack/pull/814

-- Commit Summary --

  * switch last (!) remaining std::cout to destination

-- File Changes --

    M src/mlpack/core/util/prefixedoutstream_impl.hpp (2)

-- Patch Links --

https://github.com/mlpack/mlpack/pull/814.patch
https://github.com/mlpack/mlpack/pull/814.diff

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