crypt: fix the prototype of md5_sum, sha256_sum and sha512_sum

[musl] / src / thread / pthread_rwlockattr_setpshared.c

#include "pthread_impl.h"

int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *a, int pshared)
{
        if (pshared > 1U) return EINVAL;
        *(int *)a = pshared;
        return 0;
}