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

[musl] / src / linux / utimes.c

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

int utimes(const char *path, const struct timeval times[2])
{
        return syscall(SYS_utime, path, times);
}