lftp: use a download location that keeps old versions around
Merge pull request #493 from c9/use-stable-lftp-download

Excellent, thanks!
subversion: Update to 1.7.9

CVE-2013-1845, CVE-2013-1846, CVE-2013-1847, CVE-2013-1849,
CVE-2013-1884.
krb5: Update to 1.10.5

CVE-2012-1012, CVE-2012-1013, CVE-2012-1015, CVE-2012-1016,
CVE-2013-1415, CVE-2013-1416.