[Bug 49718] ABZU broken with math functions from musl

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49718

--- Comment #6 from Piotr Caban <piotr.caban at gmail.com> ---
(In reply to Fabian Maurer from comment #5)
> Does that mean the musl implementation is broken as well...?
Not really, it just returns different value that has reasonably small error
(less than 1ULP). In this case musl implementation has bigger error though.

It's done this way in order to speed up calculation. It will be possible to
implement it with better precision using architecture dependent code (otherwise
the implementation will be too slow).

It's also interesting to take a look on values returned by acos. When native
dll is used it will return different values depending if your processor
supports SSE2 (you can also see it by calling _set_SSE2_enable(FALSE)
function). Probably in this case native falls back to some kind of architecture
independent code.

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