Yet another Mac fix.

  system/core/libziparchive/zip_archive.cc:847:36: error: use of undeclared identifier 'lseek64'; did you mean 'lseek'?
  const off64_t current_offset = lseek64(fd, 0, SEEK_CUR);

Bug: N/A
Test: builds
Change-Id: If762011722d53376bb6dab35c6ee8031762e5a95