cond.c: Use utimensat() instead of utime() for nanosecond precision
cond.c: Use utimensat() instead of utime() for nanosecond precision

We have repeatedly seen use-cases when sub-second resolution for
updatating the mtime of files have been needed.  Yes, all those
cases have been Autobots.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit