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

[musl] / src / network / getsockname.c

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

int getsockname(int fd, struct sockaddr *addr, socklen_t *len)
{
        return socketcall(getsockname, fd, addr, len, 0, 0, 0);
}