acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))

[musl] / src / linux / epoll_create1.c

#include <sys/epoll.h>
#include "syscall.h"

int epoll_create1(int flags)
{
        return syscall(SYS_epoll_create1, flags);
}