ENH: Preserve <pkg>_FIND_XXX vars in find_package
When the find_package command loads a module it sets several <pkg>_FIND_XXX variables to communicate information about the command invocation to the module. This restores the original state of the variables when the command returns. This behavior is useful when a find-module recursively calls find_package with NO_MODULE so that the inner call does not change the values in the find-module.
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