math: fix typo in i386 remquof and remquol asm
(fldl instruction was used instead of flds and fldt)

remquo asm: return quotient mod 8, as intended by the spec

this is a lot more efficient and also what is generally wanted.
perhaps the bit shuffling could be more efficient...

asm for remquo

this could perhaps use some additional testing for corner cases, but
it seems to be correct.