o Minor bugfixes:
    - Avoid a warning when building common_sha1.i out of tree. Fixes bug
      6778; bugfix on 0.2.4.1-alpha.
    - Fix mis-declared dependencies on src/common/crypto.c and
      src/or/tor_main.c that could break out-of-tree builds under some
      circumstances. Fixes bug 6778; bugfix on 0.2.4.1-alpha.