buildroot

pcre: add security patches

They address:
CVE-2016-1283 - Heap Buffer Overflow Vulnerability.
CVE-2016-3191 - workspace overflow for (*ACCEPT) with deeply nested
parentheses.

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