message: Whoops, broke FileExists
diff: @@ -185,7 +185,7 @@ bool FileSystem::FileExists(const string &filename) {
  if (access(filename.c_str(), 0) == 0) {
  struct stat status;
  stat(filename.c_str(), &status);
  - if (!(status.st_mode & S_IFREG))
  + if (!(status.st_mode & S_IFDIR))
  return true;
  }
  }
  