Apply r1513 to our PCRE bundled copy

Fixes CVE-2014-8964.

Upstream diff: http://www.exim.org/viewvc/pcre?view=revision&revision=1513



Change-Id: I59dc1f4c290e29ab5f22ed68eaeba702f4232e0e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Richard J. Moore <rich@kde.org>