allow utimes on mac os, only lutimes isn't supported

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
discard ErrNotSupportedPlatform

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
sqlite-3.6.20-1 unique constraint message

https://github.com/dotcloud/docker/issues/6551

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Merge pull request #6552 from vbatts/vbatts-gh6551

sqlite-3.6.20-1 unique constraint message
Merge pull request #6493 from vieux/fix_cp_mac_os

allow utimes on mac os, only lutimes isn't supported