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.