Chris Sauer aaaf381d9d Improvements to preprocessor conditions for falling back to std::filesystem
- Supports more Apple platforms, including future ones, which will always support std::filesystem, like with visionOS
- Simplifies cases.  Undefined preprocessor values are guaranteed to default evaluate to 0
- Moves <Availability.h> include inside conditional, avoiding the include where not needed.
- Removes reference to wchar for std headers on windows, which seemed to be out of date, since the define it might have been referring to was commented
- (And some other small things.)
2023-07-26 21:26:33 -07:00
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