fix printf format warnings

fix printf format warnings

pgrep.c: In function 'main':
pgrep.c:793:4: warning: format '%d' expects argument of type 'int', but argument 4 has type 'long int' [-Wformat]

vmstat.c: In function 'diskpartition_format':
vmstat.c:382:9: warning: format '%u' expects argument of type 'unsigned int', but argument 5 has type 'long long unsigned int' [-Wformat]
vmstat.c:408:10: warning: format '%u' expects argument of type 'unsigned int', but argument 5 has type 'long long unsigned int' [-Wformat]

w.c: In function 'main':
w.c:394:4: warning: format '%d' expects argument of type 'int', but argument 4 has type 'long unsigned int' [-Wformat]

Signed-off-by: Mike Frysinger <vapier@gentoo.org>