Merge topic 'bootstrap-c++14'

9dfb6637 bootstrap: Verify C++14 capabilities before using them

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3587
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passed cmake-dash3win10-windows-release-ninja

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passed cmake-hythloth-linux-debug-makefiles+sphinx

passed cmake-minoc-linux-release-lint-iwyu-tidy

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passed cmake-moonshade-osx-debug-ninja

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passed cmake-moonshade-osx-release-makefiles

passed cmake-terfin-windows-release-vs2019

passed cmake-hythloth-linux-debug-makefiles+sphinx

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passed cmake-hythloth-linux-debug-makefiles+sphinx

passed cmake-minoc-linux-release-lint-iwyu-tidy

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passed cmake-moonshade-osx-release-makefiles

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passed cmake-moonshade-osx-release-makefiles

passed cmake-terfin-windows-release-vs2019

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passed cmake-terfin-windows-release-vs2019