Signed-off-by: David Goulet <dgoulet@torproject.org>

"ours" to avoid version bump.

Code from dgoulet.

This shouldn't be possible while Tor is running, but the tests can
hit this code.  Rather than force the tests to add a dummy channel
object, let's just tolerate their incompletely built circuits.

Patch by Tobias Pulls.

This way, both err and log may depend on it.

There is other code that uses this value, and some of it is
apparently reachable from inside router_dir_info_changed(), which
routerlist_free() apparently calls.  (ouch!)  This is a minimal fix
to try to resolve the issue without causing other problems.

Fixes bug 31003. I'm calling this a bugfix on 0.1.2.2-alpha, where
the call to router_dir_info_changed() was added to routerlist_free().

When we added LD_MESG, we created a conflict with the LD_NO_MOCK
flag.  We now need 64 bits for log domains in order to fix this
issue.

Fixes bug 31080; bugfix on 0.4.1.1-alpha.

(a relay operator in #tor-relays just now was confused and thought
that dirportfrontpage could serve multiple files, like a real webserver.)

This reverts commit 5a2ab886.