when resolving symbols with only weak defs, use first def, not last def

[musl] / src / thread / pthread_attr_setschedparam.c

#include "pthread_impl.h"

int pthread_attr_setschedparam(pthread_attr_t *a, const struct sched_param *param)
{
        if (param->sched_priority) return ENOTSUP;
        return 0;
}