[Issue 12756] Cannot build dmd on windows because of longdouble

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12756

--- Comment #1 from Temtaime <temtaime at gmail.com> ---
Because recent MSVC's(2013 and never) supports native longdouble i think we
should remove that emulation away.

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