Update continuity vendor to d8fb85

Includes a fix for 32bit systems

Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>

vendor/github.com/containerd/continuity/fs/stat_linux.go

@@ -22,5 +22,6 @@ func StatMtime(st *syscall.Stat_t) syscall.Timespec {
 
 // StatATimeAsTime returns st.Atim as a time.Time
 func StatATimeAsTime(st *syscall.Stat_t) time.Time {
-	return time.Unix(st.Atim.Sec, st.Atim.Nsec)
+	// The int64 conversions ensure the line compiles for 32-bit systems as well.
+	return time.Unix(int64(st.Atim.Sec), int64(st.Atim.Nsec)) // nolint: unconvert
 }

vendor/github.com/containerd/continuity/sysx/xattr_openbsd.go

@@ -0,0 +1,7 @@
+package sysx
+
+import (
+	"errors"
+)
+
+var unsupported = errors.New("extended attributes unsupported on OpenBSD")

vendor/github.com/containerd/continuity/sysx/xattr_unsupported.go

@@ -1,4 +1,4 @@
-// +build freebsd solaris
+// +build freebsd openbsd solaris
 
 package sysx