msi - partly implement MsiMessageBox[A/W]

[Steven Edwards]

I don't know what the unknown DWORD for th last paramater does but it
does not seem too important. The PSDK installer fails with both native
and builtin msi however ours lacked the nice MessageBox.

Changelog:
Partly implement MsiMessageBox[A/W] on top of MessageBoxEx[A/W]
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