Use std::cerr for folly/Singleton.cpp error printing
Use std::cerr for folly/Singleton.cpp error printing

Summary:
Create a local std::ios_base::Init instance to ensure that it is valid, then
use std::cerr.

Reviewed By: yfeldblum, nbronson

Differential Revision: D4139681

fbshipit-source-id: 03377dd417710e320a6b53298d507fd0168592f6

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