[Issue 20759] Invalid printf checks for long double on win64

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20759

--- Comment #3 from kinke <kinke at gmx.net> ---
(In reply to moonlightsentinel from comment #2)
> Should a user have to replace this with e.g.:

Of course not, that's why LDC diverges. ;) The proper long-term solution is IMO
redefining D `real` as corresponding to C `long double`, not the 'largest FP
size implemented in hardware'.

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