update to 1.8.6p7
    
    - fixes CVE-2013-1775 and CVE-2013-1776
    - fixed several packaging issues (thanks to ville.skytta@iki.fi)
      - build with system zlib.
      - let rpmbuild strip libexecdir/*.so.
      - own the %{_docdir}/sudo-* dir.
      - fix some rpmlint warnings (spaces vs tabs, unescaped macros).
      - fix bogus %changelog dates.