libxvmc - security update

• CVE-2016-7953
  If an empty string is received from an x-server, do not underrun
  the buffer by accessing “rep.nameLen - 1” unconditionally, which
  could end up being -1.

For Debian 7 Wheezy, these problems have been fixed in version
2:1.0.7-1+deb7u3.

We recommend that you upgrade your libxvmc packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;