use weak aliases rather than function pointers to simplify some code

[musl] / src / thread / pthread_cond_broadcast.c

#include "pthread_impl.h"

int pthread_cond_broadcast(pthread_cond_t *c)
{
        c->_c_block = 0;
        __wake(&c->_c_block, -1, 0);
        return 0;
}