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

[musl] / src / linux / signalfd.c

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

int signalfd(int fd, const sigset_t *sigs, int flags)
{
        return syscall(SYS_signalfd, fd, sigs, 8);
}