Mark ~BufferedIOWriter() noexcept(false) (#1459)
Mark ~BufferedIOWriter() noexcept(false) (#1459)

Summary:
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/1459

In C++11, destructors default to `noexcept(true)`. This destructor can throw (through `FAISS_THROW_IF_NOT()`), so marking it accordingly.

Reviewed By: mdouze

Differential Revision: D24253879

fbshipit-source-id: 7ba40387ed214dc2a03a495bc0d31ac9601c4c15

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