* scripts/dpkg-shlibdeps: start using objdump as opposed to ldd, this

  * scripts/dpkg-shlibdeps: start using objdump as opposed to ldd, this
    works much more cleanly, works with libc5, and allows from better
    error reporting. Also corrected checks on shlibs.local, which wasn't
    really being parsed, it now works as advertised.
  * scripts/{dpkg-gencontrol,dpkg-source,controllib.pl}: fixed references
    to old style build dep fields to match current policy ammendment