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Summary:
Commit b4c66d1f broke all the CIs.
The new policy changes the timestamp of configuration files of third party libraries,
which triggers re-configuration which requires extra tools.

This commit fixes it by reverting the old behavior.
Also this adds guard for older cmake versions.

Pull Request resolved: https://github.com/pytorch/audio/pull/3046

Reviewed By: atalman

Differential Revision: D43133536

Pulled By: mthrok

fbshipit-source-id: 357055c8c1b53e593b8b7880f2045e13512c7a8f