Add support for <bits/extc++.h>

[dnx04]

Description / 説明

The code bundle feature is ok for <bits/stdc++.h>, but not <bits/extc++.h>. Please configure the bundle such that it can parse the file with <bits/extc++.h> included.

Motivation / 動機

<bits/extc++.h> is the extension of <bits/stdc++.h>, with many new features.

Other notes / その他

• Will you try to create a pull request?
  • no, I don't know how to work with the bundle.