Back in 2004 the "new" build tools was introduced 2668c74b58
which are located in `src/Tools/fcbt/`. The new tools split up this file
into `src/Tools/fcbt/DistTools.py` and `src/Tools/fcbt/FilesTools.py`
which is why the both `DistTools.py` doesn't match up 1:1.
I've found no references in the repo to the version in `src/Tools/` so
I think it's safe to remove.