Bug#764357: non-free file in package

[Tsukasa #01 (OI)]

Hi,

How about editdist.c in py-editdist (edit distance imlementation for
Python but the core is implemented in C) as a replacement of non-free
edit_dist.c?

It looks this file (and py-editdist) is licensed under the ISC License
(which is free) and looks okay.

One thing to note is, it uses older version of license text (Permission
to use, copy, modify, "and"; latest version uses "and/or" for the
clarification of the license).
I think there is an option to ask the author for license.

Thanks,

Tsukasa OI