tools: Create reg key for msxml6

[Nikolay Sivov]

For http://bugs.winehq.org/show_bug.cgi?id=30078

What I checked:
- msxml6 registration doesn't create this key so it must be created by 
installer itself,
- a patch doesn't break msxml6 installer, so no worries here, installer 
doesn't care if key is present already

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