Fix possible symlink race (CVE-2012-6095)
- Fix possible symlink race when applying UserOwner to newly created directory
(CVE-2012-6095, #892715, http://bugs.proftpd.org/show_bug.cgi?id=3841)
- Add -fno-strict-aliasing, needed for mod_radius
- Drop %defattr, redundant since rpm 4.4