automation: add extra arguments when building Inno
These were being fed into the template expansion but not being
used. This meant --version was not getting set when it should have
been.
Differential Revision: https://phab.mercurial-scm.org/D8482
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.