buildroot

php: security bump to version 5.3.15

Fix for CVE-2012-2688 (potential overflow in _php_stream_scandir),
CVE-2012-3365 (SQLite open_basedir bypass) and other misc bugfixes.

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