The sys.StatATimeAsTime() utility is currently only used in a single place,
but because it's living in the "sys" package, also brings in other dependencies,
such as Microsoft/hcsshim.
This patch inlines the code from sys.StatATimeAsTime(), to remove that dependency.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
63c185da9a