[fusl] Remove LFS64 macro

fusl/src/dirent/readdir.c

 #include <dirent.h>
 #include <errno.h>
 #include "__dirent.h"
 #include "syscall.h"
 #include "libc.h"
 
 int __getdents(int, struct dirent*, size_t);
 
 struct dirent* readdir(DIR* dir) {
   struct dirent* de;
 
   if (dir->buf_pos >= dir->buf_end) {
     int len = __syscall(SYS_getdents, dir->fd, dir->buf, sizeof dir->buf);
     if (len <= 0) {
       if (len < 0 && len != -ENOENT)
         errno = -len;
       return 0;
     }
     dir->buf_end = len;
     dir->buf_pos = 0;
   }
   de = (void*)(dir->buf + dir->buf_pos);
   dir->buf_pos += de->d_reclen;
   dir->tell = de->d_off;
   return de;
 }
-
-LFS64(readdir);