Update CLONE_* constants

* xlat/clone_flags.in: Rename CLONE_STOPPED to CLONE_NEWCGROUP.
The former was removed by linux kernel commit v2.6.38-rc1~217.
The latter was introduced by linux kernel commit v4.6-rc1~67^2~8.
diff --git a/xlat/clone_flags.in b/xlat/clone_flags.in
index 8616428..2b08c79 100644
--- a/xlat/clone_flags.in
+++ b/xlat/clone_flags.in
@@ -14,7 +14,7 @@
 CLONE_CHILD_CLEARTID	0x00200000
 CLONE_UNTRACED	0x00800000
 CLONE_CHILD_SETTID	0x01000000
-CLONE_STOPPED	0x02000000
+CLONE_NEWCGROUP	0x02000000
 CLONE_NEWUTS	0x04000000
 CLONE_NEWIPC	0x08000000
 CLONE_NEWUSER	0x10000000