tests/test-gendoc-zh_TW.t

pyoxidized: add a `pyoxidizer` hghave keyword for line matching

Some output line can be affected by pyoxidizer, for example the source file path
are replaced by the module name. We introduce a new condition keyword to cope
with this.

Differential Revision: https://phab.mercurial-scm.org/D11283

#require docutils gettext

  $ $TESTDIR/check-gendoc zh_TW
  checking for parse errors