acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))
[musl] / src / math / i386 / ceill.s
2012-03-19 nszMerge branch 'master' of git://git.etalabs.net/musl
2012-03-19 Rich Felkerasm for floor/ceil/trunc