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Avoid complete rebuild on cmake run with git info change

Robert Schmidt requested to merge fix-excessive-rebuilds into develop

Before these changes, the following will trigger a complete rebuild:

  • create another git name (git checkout -b test)
  • run cmake again manually (cmake ..)
  • run ninja again

This is fixed in this commit; switching branches and re-compiling should take less time. For explanations, check the commit message.

Later work will reuse this in the CI to speed up builds.

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