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Brad King authored
The change in commit a5dd1599 (Tests: Fix RunCMake.try_compile CxxStandard case on MSVC, 2017-09-22, v3.10.0-rc1~63^2) introduced use of `if()` conditions not supported until CMake 3.7, so while it was intended to restore support for CMake versions prior to 3.9, it actually only did so for 3.7 and 3.8. Backport the logic to work with CMake 3.1. Fixes: #18987
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