add_key.2, clock_getres.2, clone.2, futex.2, getdents.2, getpid.2, getrlimit.2, ioctl...

add_key.2, clock_getres.2, clone.2, futex.2, getdents.2, getpid.2, getrlimit.2, ioctl_ns.2, kcmp.2, keyctl.2, memfd_create.2, request_key.2, stat.2, timer_create.2, wait.2, clock_getcpuclockid.3, dl_iterate_phdr.3, getgrent_r.3, getpwent_r.3, getpwnam.3, posix_spawn.3, pthread_getcpuclockid.3, strcat.3, feature_test_macros.7, user_namespaces.7: Switch printf() casts to use [u]intmax_t + %ju / %jd

Let's move to the 21st century. Instead of casting system data
types to long/long long/etc. in printf() calls, instead cast to
intmax_t or uintmax_t, the largest available signed/unsigned
integer types.

[mtk: rewrote commit message]

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>