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

[musl] / src / thread / pthread_condattr_init.c

#include "pthread_impl.h"

int pthread_condattr_init(pthread_condattr_t *a)
{
        memset(a, 0, sizeof *a);
        return 0;
}