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Simplify variable reference and escape sequence evaluation.

CMake 3.1 introduced a much faster implementation of evaluation of the Variable References and Escape Sequences documented in the cmake-language(7) manual. While the behavior is identical to the legacy implementation in most cases, some corner cases were cleaned up to simplify the behavior. Specifically:

The OLD behavior for this policy is to honor the legacy behavior for variable references and escape sequences. The NEW behavior is to use the simpler variable expansion and escape sequence evaluation rules.

This policy was introduced in CMake version 3.1. CMake version |release| warns when the policy is not set and uses OLD behavior. Use the cmake_policy command to set it to OLD or NEW explicitly.