I can find the API-docs for JavaHL 1.6 at http://subversion.apache.org/docs/javahl/1.6/ . However I can't find any pointer to a jar+native binary (win32) package, or maven resource. Where do you obtain these artifacts?
There seems no obvious way to retrieve them directly (searched in some Maven repos). JavaHL (win32) is part every current eclipse version with subversive in it. So technically, the following would work:
Subversive
.plugins/org.polarion.eclipse.team.svn.connector.javahl16.win32_<version-nr>
Perhaps this workaround helps you, but I am interested in the "real" solution as well.