Apply patch by Raphael Hertzog that:

Apply patch by Raphael Hertzog that:

1) Add a new script dpkg-gensymbol that can produce lists of
   symbols from shared libraries
2) Modifies dpkg-shlibdeps so that it can use these lists to
   compute better (i.e. less strict) shlib dependencies.
3) Refactors a lot of code on the way and moves some out to
   modules (that are not usable for third-party use yet, though
   and will be installed in dpkg's private library directory