Justin Chadwell 22ac3271d2 vendor: update moby/buildkit
Update modules:

  go mod edit -require github.com/moby/buildkit@master
  go mod tidy -compat=1.17 && ./hack/update-vendor

Signed-off-by: Justin Chadwell <me@jedevc.com>
..
README.md vendor: initial vendor
nodata_linux.go vendor: initial vendor
nodata_solaris.go vendor: initial vendor
nodata_unix.go vendor: update buildkit to 2f99651
xattr.go vendor: update buildkit to 539be170
xattr_unsupported.go vendor: update buildkit to 539be170

README.md

This package is for internal use only. It is intended to only have temporary changes before they are upstreamed to golang.org/x/sys/ (a.k.a. https://github.com/golang/sys).