update runc to v1.0.0-rc93

full diff: https://github.com/opencontainers/runc/compare/v1.0.0-rc92...v1.0.0-rc93

also removes dependency on libcontainer/configs

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/opencontainers/runc/libcontainer/configs/namespaces_syscall.go

@@ -1,32 +0,0 @@
-// +build linux
-
-package configs
-
-import "golang.org/x/sys/unix"
-
-func (n *Namespace) Syscall() int {
-	return namespaceInfo[n.Type]
-}
-
-var namespaceInfo = map[NamespaceType]int{
-	NEWNET:    unix.CLONE_NEWNET,
-	NEWNS:     unix.CLONE_NEWNS,
-	NEWUSER:   unix.CLONE_NEWUSER,
-	NEWIPC:    unix.CLONE_NEWIPC,
-	NEWUTS:    unix.CLONE_NEWUTS,
-	NEWPID:    unix.CLONE_NEWPID,
-	NEWCGROUP: unix.CLONE_NEWCGROUP,
-}
-
-// CloneFlags parses the container's Namespaces options to set the correct
-// flags on clone, unshare. This function returns flags only for new namespaces.
-func (n *Namespaces) CloneFlags() uintptr {
-	var flag int
-	for _, v := range *n {
-		if v.Path != "" {
-			continue
-		}
-		flag |= namespaceInfo[v.Type]
-	}
-	return uintptr(flag)
-}