setup: properly install build_hgextindex for py2exe builds
Because the hgbuild class has a private copy of build.sub_commands,
modifying build.sub_commands from this code effectively resulted
in a no-op. Registering the sub-command on hgbuild actually results
in the sub-command running when building Mercurial.
Differential Revision: https://phab.mercurial-scm.org/D6093
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)