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FindDoxygen: Ensure policy settings allow use of IN_LIST

Brad King requested to merge brad.king/cmake:FindDoxygen-CMP0057 into master

In !684 (merged) use of the IN_LIST condition was added, but this is only supported when policy CMP0057 is set to NEW. Add a policy scope around the module and enable the policy within it. Otherwise it works only in projects that happen to enable the policy.

Fixes: #18361 (closed)

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