[openssl-dev] [openssl.org #3964] Fix OPENSSL_NO_STDIO build

[Andy Polyakov via RT]

To question about OPENSSL_stderr() that was removed with "not used"
rationale. When it comes to a *library* you always run risk of finding
something that it not used by the library itself, something that is
meant to be used exclusively by somebody else's application. And
OPENSSL_stderr() is such thing. Well, for a Unix person it's really
meaningless function, but it was introduced to solve small but
irritating problem in FIPS module context on Windows.