in pipe2, use pipe() rather than __syscall(SYS_pipe, ...) for fallback

[musl] / src / unistd / unlinkat.c

#include <unistd.h>
#include "syscall.h"

int unlinkat(int fd, const char *path, int flag)
{
        return syscall(SYS_unlinkat, fd, path, flag);
}