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Extend C++17/C++14 feature checks to require unique_ptr

Brad King requested to merge brad.king/cmake:check-unique_ptr-pgi into master

When testing compiler modes higher than C++11 for constructs we need, include a check for using unique_ptr in that mode. The PGI 18.4 compiler in some environments supports unique_ptr in C++11 mode but is broken for C++14 and C++17. Check that unique_ptr works in these modes before using one.

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