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[csmith-project/csmith] eaaabc: Avoid error when using CMake pre-3.0.

  Branch: refs/heads/master
  Home:   https://github.com/csmith-project/csmith
  Commit: eaaabcf73441b1c4aa6496a719bd968ea0c201d8
      https://github.com/csmith-project/csmith/commit/eaaabcf73441b1c4aa6496a719bd968ea0c201d8
  Author: Eric Eide <eeide@cs.utah.edu>
  Date:   2017-06-24 (Sat, 24 Jun 2017)

  Changed paths:
    M runtime/CMakeLists.txt

  Log Message:
  -----------
  Avoid error when using CMake pre-3.0.

Check for policy CMP0042.  If it is not known, don't try to set it.
This check-before-set idiom is suggested by the CMake documentation.
See <https://cmake.org/cmake/help/v3.0/manual/cmake-policies.7.html>.

Without this check, CMake pre-3.0 gives an error.

BTW, did you know that CMake 2.8 is the default on CentOS 7.3?