(R4300) Nebuleon: Do not set rounding mode before exact floating-point
operations and before floating-point widening conversions - see
https://github.com/Nebuleon/mupen64plus-core/commit/636ef6b14be645da5ccedba7aa56dc41feb481a4
and
https://github.com/Nebuleon/mupen64plus-core/commit/c61eb6feef26478292cea559473643c97f54b88f