tor/changes/trove-2017-001.2

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o Major bugfixes (parsing):
- Fix an integer underflow bug when comparing malformed Tor versions.
This bug is harmless, except when Tor has been built with
--enable-expensive-hardening, which would turn it into a crash;
or on Tor 0.2.9.1-alpha through Tor 0.2.9.8, which were built with
-ftrapv by default.
Part of TROVE-2017-001. Fixes bug 21278; bugfix on
0.0.8pre1. Found by OSS-Fuzz.