busybox: use CLOCK_MONOTONIC instead of gettimeofday
The clock_gettime(CLOCK_MONOTONIC) syscall exists for so long that the first
kernel version to support it is not even specified in the man page [1]. Let's
enable it on BusyBox by default. Otherwise, gettimeofday will be used instead,
which will give wrong results if the date/time is reset (time moving backwards).
[1] https://linux.die.net/man/2/clock_gettime
Signed-off-by: Rui Salvaterra <[email protected]>
Rui Salvaterra