package/nfs-utils: fix printfs format build failure on 64-bits platforms

Add 2 upstream patches from nfs-utils that fix build failures on
64-bits where time_t is assumed to be a long long when passed to
printf("%ld"), but that is not always true, so in these patches the
author (Petr) uses PRIu64 tag.

Fixes:
http://autobuild.buildroot.net/results/9bc1d43a588338b7395af7bc97535ee16a6ea2d9/



Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Cc: Petr Vorel <petr.vorel@gmail.com>
Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>