Vendor in latest containers storage

We want to get support into skopeo for handling
override_kernel_checks so that we can use overlay
backend on RHEL.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/storage/pkg/system/chtimes.go

@@ -2,26 +2,9 @@ package system
 
 import (
 	"os"
-	"syscall"
 	"time"
-	"unsafe"
 )
 
-var (
-	maxTime time.Time
-)
-
-func init() {
-	if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 {
-		// This is a 64 bit timespec
-		// os.Chtimes limits time to the following
-		maxTime = time.Unix(0, 1<<63-1)
-	} else {
-		// This is a 32 bit timespec
-		maxTime = time.Unix(1<<31-1, 0)
-	}
-}
-
 // Chtimes changes the access time and modified time of a file at the given path
 func Chtimes(name string, atime time.Time, mtime time.Time) error {
 	unixMinTime := time.Unix(0, 0)