graphite2: security bump to version 1.3.5

Fixes:
CVE-2016-1521 - An exploitable out-of-bounds read vulnerability exists
in the opcode handling functionality of Libgraphite. A specially crafted
font can cause an out-of-bounds read resulting in arbitrary code
execution. An attacker can provide a malicious font to trigger this
vulnerability.
CVE-2016-1522 - An exploitable NULL pointer dereference exists in the
bidirectional font handling functionality of Libgraphite. A specially
crafted font can cause a NULL pointer dereference resulting in a crash.
An attacker can provide a malicious font to trigger this vulnerability.
CVE-2016-1523 - An exploitable heap-based buffer overflow exists in the
context item handling functionality of Libgraphite. A specially crafted
font can cause a buffer overflow resulting in potential code execution.
An attacker can provide a malicious font to trigger this vulnerability.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>