openssh: Exclude CVE-2008-3844 from cve-check

CVE only applies to some distributed RHEL binaries so irrelavent to us.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 5d8b3ddf)
Signed-off-by: Steve Sakoman <steve@sakoman.com>