package/exfatprogs: add patch fixing missing <sys/types.h>

This patch had been merged by upstream but appears to have been
accidentially overwritten with a force push. Let's add back the
rebased version until fixed by upstream.

Fixes:
http://autobuild.buildroot.net/results/667/667409f1d44a3f9be43aaff3f9a3426fe1386de2/build-end.log



Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>