package/rsync: fix CVE-2020-14387

package/rsync: fix CVE-2020-14387

A flaw was found in rsync in versions since 3.2.0pre1. Rsync improperly
validates certificate with host mismatch vulnerability. A remote,
unauthenticated attacker could exploit the flaw by performing a
man-in-the-middle attack using a valid certificate for another hostname
which could compromise confidentiality and integrity of data transmitted
using rsync-ssl. The highest threat from this vulnerability is to data
confidentiality and integrity. This flaw affects rsync versions before
3.2.4.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Peter: add a comment explaining what patch fixes this CVE]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>