package/samba4: Fix uClibc build on 64bit platforms by including stdint.h

Patch needed to be updated for samba-4.8.4

Fixes
http://autobuild.buildroot.net/results/140/1404a594583ff192d70086ef590f924472465c89/



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>