This should prevent some annoying messages such as:
tar: usr/bin/nix-build: time stamp 2013-07-09 07:45:19 is 0.159248271 s in the f
uture
tar: usr/bin/nix-channel: time stamp 2013-07-09 07:45:19 is 0.159088763 s in the
future
tar: usr/bin/nix-collect-garbage: time stamp 2013-07-09 07:45:19 is 0.15901664 s
in the future
tar: usr/bin/nix-copy-closure: time stamp 2013-07-09 07:45:19 is 0.158948028 s i
n the future
tar: usr/bin/nix-daemon: time stamp 2013-07-09 07:45:19 is 0.158888042 s in the
future
Signed-off-by: aszlig <aszlig@redmoonstudios.org>