mpegvideo_motion: Handle edge emulation even without unrestricted_mv

Fix out of bounds read.

Bug-Id: 959
Found by: F4B3CD@STARLAB and Agostino Sarubbo
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
(cherry picked from commit 136f55207521f0b03194ef5b55ba70f1635d6aee)
Signed-off-by: Diego Biurrun <diego@biurrun.de>
Gbp-Pq: Name mpegvideo_motion-Handle-edge-emulation-even-without-.patch

disable-configuration-warnings

Gbp-Pq: Name 03-disable-configuration-warnings.patch

configure-disable-ebx-gcc-4.9

Gbp-Pq: Name 02-configure-disable-ebx-gcc-4.9.patch

libav (6:11.8-1~deb8u1) jessie-security; urgency=medium

  * New upstream release.
  * debian/upstream-signing-key.pgp: Update upstream signing key.
  * debian/patches/mpegvideo_motion-Handle-edge-emulation-even-without-.patch:
    Fix NULL pointer dereference in put_no_rnd_pixels8_xy2_mmx. (CVE-2016-7424)

[dgit import unpatched libav 6:11.8-1~deb8u1]

Import libav_11.8.orig.tar.xz

[dgit import orig libav_11.8.orig.tar.xz]

Import libav_11.8-1~deb8u1.debian.tar.xz

[dgit import tarball libav 6:11.8-1~deb8u1 libav_11.8-1~deb8u1.debian.tar.xz]