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Set cmake_policy in SFMLConfig.cmake

`SFMLConfig.cmake` uses the `if(... IN_LIST` feature which requires
policy `CMP0057` to be enabled (added in CMake 3.3). If an application
uses `find_package(SFML)` with a minimum CMake version set to less
than `3.3`, the `IN_LIST` lines cause a CMake error.

Fix this by setting the minimum CMake policy we require in
`SFMLConfig.cmake`. CMake keeps a policy stack so this does not affect
the application's policy.

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