minor cleanup for build issues
minor cleanup for build issues

Signed-off-by: Mike Brown <392d1074b9aea7041f97d21fe1e0b35c6b1de152@us.ibm.com>

mikebrow/skopeo,projectatomic/skopeo,mtrmac/skopeo,mikebrow/skopeo,mtrmac/skopeo,jwhonce/skopeo,projectatomic/skopeo,jwhonce/skopeo,mtrmac/skopeo