tor/changes/bug10363

  o Major bugfixes:
    - Fix two instances of possible undefined behavior in channeltls.c
      that could, under unlucky circumstances, have led to a pointer
      overflow. Fixes bug #10363; bugfixes on 0.2.0.10-alpha and
      0.2.3.6-alpha. Reported by "bobnomnom".
    - Fix another possibly undefined pointer operations in tor_memmem
      fallback implementation. Another case of bug #10363; bugfix on
      0.1.1.1-alpha.
    - Fix another possibly undefined pointer operations in the eventdns
      fallback implementation. Another case of bug #10363; bugfix on
      0.1.2.1-alpha.