clone/clone08.c: add new tests

Add new tests for clone(2):
CLONE_PARENT
CLONE_CHILD_SETTID
CLONE_PARENT_SETTID
CLONE_STOPPED
CLONE_THREAD

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Reviewed-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
diff --git a/runtest/syscalls b/runtest/syscalls
index c5bbe8f..afa7976 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -85,6 +85,7 @@
 clone05 clone05
 clone06 clone06
 clone07 clone07
+clone08 clone08
 
 close01 close01
 close02 close02