When the relay module is disabled, we change the ClientOnly
default to 1. But we forgot to mention that in the changes file.

"ours" to avoid version bump.

The src/feature directory documentation now covers this better.

Closes ticket 32467.

These tests will also pass on 0.4.3, with the original implementation,
and with the new implementation in 32404.

Part of 32295 and 32404.

"git merge --strategy ours", because:
* 32295 is a quick fix for 0.4.2 only
* 32404 has a better implementation for master

This is a basic fix for 0.4.2 only. The fix for 0.4.3 and later
is in 32404.

Fixes bug 32295; bugfix on 0.4.2.1-alpha.

Install the mingw OpenSSL package in Appveyor. This makes sure that
the OpenSSL headers and libraries match in Tor's Appveyor builds.

(This bug was triggered by an Appveyor image update.)

Fixes bug 32449; bugfix on 0.3.5.6-rc.

And document the "%include" behaviour.

Closes 32450.