tor/changes/bug10402

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o Major bugfixes:
- Do not allow OpenSSL engines to replace the PRNG, even when
HardwareAccel is set. The only default builtin PRNG engine uses
the Intel RDRAND instruction to replace the entire PRNG, and
ignores all attempts to seed it with more entropy. That's
cryptographically stupid: the right response to a new alleged
entropy source is never to discard all previously used entropy
sources. Fixes bug 10402; works around behavior introduced in
OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
and "rl1987".