Stabilize llvm/test/Object/archive-update.test a bit.

A manipulation (in this case, mkdir) can make slack between creating and touching %t.older/evenlen.

I would make this rewrote with python if this were still unstable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254965 91177308-0d34-0410-b5e6-96231b3b80d8
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