After a clone system call there are two threads of control running so we
need to make sure the child exits or we will get two copies of the output
from each test which follows. Also some older systems do not define the
CLONE_PARENT_SETTID flag.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3007 a5019735-40e9-0310-863c-91ae7b9d1cf9
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