Currently test patterns show a systematic failure with Windows 7. https://test.winehq.org/data/patterns.html#msxml6:saxreader
This is caused by the VisualBasic wrappers crashing when receiving some NULL parameters.
Would this qualify for a version check like in a few other more central tests?
If it would, is leaving the indentation that way ok?
[This is a testbot run](https://testbot.winehq.org/JobDetails.pl?Key=151665) with this patch.
-- v2: msxml6/tests: Make test pass with Windows 7.