Title: #213: Build system refactoring phase 3
> autoconf and automake files are not removed (Makefile.in, /config.sub ...)
According to [Automake manual section 13 What Gets
must not remove files necessary for `./configure`.
As far as I can tell from testing, make distclean + PR #220 leaves behind only
files generated by `autoreconf` so we should not remove any of them. It would
prevent users from running `configure` again.
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