Cannot build on 32bit or ARM Scaleway server (ARM 32bit, armv7l)

see https://github.com/docker/docker/issues/15053

Seems that `seccomp` currently supports `linux/amd64` only right now. There is only a file [jump_amd64.go](https://github.com/opencontainers/runc/blob/master/libcontainer/seccomp/jump_amd64.go), and no `jump_386.go`, `jump_arm.go` nor `jump_arm64.go`.

Any plans to support `linux/386`, `linux/arm` and `linux/arm64` soon?
