go.mod: github.com/Microsoft/hcsshim v0.8.16

full diff: https://github.com/microsoft/hcsshim/compare/v0.8.15...v0.8.16

also updating github.com/Microsoft/hcsshim/test to current master

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/golang.org/x/sys/unix/xattr_bsd.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build freebsd || netbsd
 // +build freebsd netbsd
 
 package unix