iff: validate CMAP palette size

Fixes CVE-2013-2495

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

CC: libav-stable@libav.org
(cherry picked from commit 50c449ac24fbb4c03c15d2e2026cef2204b80385)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
fate: fetch samples that match the release series

The idea is to ensure that 'make fate-rsync' always fetches the fate
samples that work with this release.
add missed CVE reference in 9.2 release
update Changelog