This one has no generated code.

Apparently it has no testing variant.

This change makes it possible for us to change the list of libraries
more easily, without changing every single linker line.

"Ours" merge to avoid version bump.

When I wrote the first one of these, it needed the path of the geoip
file.  But that doesn't translate well in at least two cases:

   - Mingw, where the compile-time path is /c/foo/bar and the
     run-time path is c:\foo\bar.

   - Various CI weirdnesses, where we cross-compile a test binary,
     then copy it into limbo and expect it to work.

Together, these problems precluded these tests running on windows.

So, instead let's just generate some minimal files ourselves, and
test against them.

Fixes bug 25787

Fix a memory leak where directory authorities would leak a chunk of
memory for every router descriptor every time they considered voting.

This bug was taking down directory authorities in the live network due
to out-of-memory issues.

Fixes bug 26435; bugfix on 0.3.3.6.