setup.py: remove unused and harmful code importing mercurial
This was failing on some build system we have. The import seemed to
succeed, but then mercurial.__all__ would fail. I don't know why, but
since it's unused anyway, let's just drop it.
exclude contrib/nopushpublish.py
exclude hgext3rd/evolve/hack/*.py
exclude hgext3rd/evolve/legacy.py
exclude Makefile
exclude tests/test-drop.t
exclude tests/test-inhibit.t
exclude tests/test-oldconvert.t
include COPYING
include docs/figures/hgview-example.png
include docs/makefile
include docs/*.py
include docs/README
include docs/*.rst
include docs/static/*.svg
include docs/tutorials/*.t
include hgext3rd/__init__.py
include hgext3rd/evolve/__init__.py
include hgext3rd/evolve/serveronly.py
include MANIFEST.in
include README
include setup.py
include tests/*.py
include tests/*.sh
include tests/*.t
prune debian
recursive-include docs/figures *.svg