[PATCH] Sync msiexec againt wine

[Christoph Brill]

Hi list,

attached is a patch that updates our msiexec from the wine sources. From
what I can tell it has 2 major changes:

- option handling is now much more sane (no "if (!xyz)" but "if (xyz)")
- addition of argument "/regserver"

I also added the icon from wine for msiexec. Not sure if it's ok. Tell
me if I should create another (if someone tells me how the icon should
look like I would do a better one).

Regards,
  Christoph Brill