Use Time::HiRes when available and fallback to raw syscall interface
when not. If that fails too, simply report 0, 0 as real time.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Replace the GNU time program invocation with a simple Perl script reporting
the timing values. Since we require Perl anyway for the build system, we can
as well use that instead of requiring a random GNU utility rarely installed
by default.
Fixes: ff6e62b288 ("build: log time taken by each packages/steps")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>