[Issue 17007] let std.math work in CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17007
Issue 17007 depends on issue 21408, which changed state.

Issue 21408 Summary: Make std.math.nextUp and nextDown and nextafter work in CTFE for extended-precision real
https://issues.dlang.org/show_bug.cgi?id=21408

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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