fio: Add patch to import stdint.h explicitly

This patch is upstream and it can be removed in the next version bump.

Fixes:
http://autobuild.buildroot.net/results/dc7/dc75b1f5ca4db5fb4658f19fde56b18cb7170fe9/
http://autobuild.buildroot.net/results/44d/44dd45e0f693ea84fc072ab28f038bf04a9226ec/



Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>