Rebuild schema/fs.go.
Rebuild schema/fs.go.

This only commits the result of (make schema-fs) and is otherwise
unrelated to the rest of the PR.

Signed-off-by: Miloslav Trmač <9c008e38982a5397deb855345fb164f0558459ae@redhat.com>

opencontainers/image-spec,opencontainers/image-spec,jonboulle/image-spec,jonboulle/image-spec