MSVC: make #4526 pass (use #if for optional) - fixes #3859; re-amalgamate #4970

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chelseadzdr wants to merge 7 commits into nlohmann:develop from chelseadzdr:fix-msvc-optional

+65 −65

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MSVC: make #4526 pass (use #if for optional) - fixes #3859; re-amalgamate #4970

Merge branch 'develop' of https://github.com/chelseadzdr/json into fi…

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