With the git checkouts of Hurd components in build-many-glibcs.py
involving running autoreconf, there's a risk that generated files
could be left behind by an old autoreconf run (if an old version of
the sources generates those files in the source directory but a new
version does not).
This patch avoids that by using git clean -dxfq when updating git
checkouts. In this patch, that's conditional on --replace-sources, to
avoid removing any local not-checked-in files someone may have in
their checkout unless the option has been specifically passed that
says it's OK to blow old checkouts away, complete with any local
changes to them.
* scripts/build-many-glibcs.py (Context.git_checkout): Use git
clean -dxfq for git updates when replacing sources.
e3aa6999d7