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_CN
checking for parse errors