doc/ missing in build directory for out-of-tree builds
**autoconf** allows building tor outside the source directory using `--srcdir=DIR`.
In that case, _doc/_ is not copied or symlinked from source to build directory, causing pages to be unnesseccarily regenerated using **rst2man**.
Would it be possible to adjust the _configure_ stage to account for this?
Specifically, this would allow complete out-of-tree builds at least on OpenBSD, where where the following quirk is required after _configure_ and before _build_ stage to enable separation without **py-docutils** as additional build dependency:
```
pre-build:
ln -sf ${WRKSRC}/doc/ ${WRKBUILD}/
```
**Trac**:
**Username**: kn
issue