Fix a few issues with the lib32 dist so that it includes ldd32.
- Use a better find invocation to purge empty directories from all the dist
trees during a release build. The previous version did not purge
directories whose contents were all empty directories.
- Explicitly blacklist a few files from the lib32 dist instead of using a
whitelist. A better longterm solution is to fix the few offenders to not
install data files during a lib32 install.
Approved by: re (kib)
