Fixes for building MSI using wix (without nowow)
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MSI: Package: only allow perMachine installation not necessary but makes it clear
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MSI: Make SourceDir the path to executables not necessary but makes it easier to build with - no need for bin/ directory
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Ignore spice-protocol untracked files Unrelated -- If you want I can send it as a separate MR
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Patch that was not sent: MSI: remove NoWOW. There is no need for NoWOW in the condition, but with mingw32 build wixl fails without it.