Enable seccomp for s390x and ppc

[michael-holzheu]

To enable seccomp for s390x and ppc we need to do the steps described in Docker issue moby/moby#23171.

For runc we have to:

• Add runc patch seccomp: Add ppc and s390x to seccomp/config.go #864 [already merged]
• Bump versions in Godeps directory that include:
  • libseccomp-golang [1] : seccomp/libseccomp-golang@32f571b
  • runtime-spec [2] : seccomp: Add ppc and s390x to specs-go/config.go runtime-spec#475 [merged -> d6fbe04]

Ping @cyphar (since you did PR #842)
Ping @justincormack

[crosbymichael]

@michael-holzheu is this fully resolved now? I think we have everything merged..

[justincormack]

@crosbymichael no there is one commit missing from libseccomp-golang from here, 32f571b

[michael-holzheu]

@michael-holzheu is this fully resolved now? I think we have everything merged..

As @justincormack already noticed, the following commit is still missing: seccomp/libseccomp-golang@32f571b