acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))
[musl] / src / thread / pthread_detach.c
2011-09-16 Rich Felkerfix more instances of old a_xchg (use new a_swap name)
2011-02-12 Rich Felkerinitial check-in, version 0.5.0