RESEND: MSIEXEC: Make installation of InstMsiA.exe possible

[Hans Leidekker]

I have an InstMsiA.exe that uses two undocumented msiexec command line
parameters: /m and /D and uses an undocumented modifier (!) with the /q
parameter. Our msiexec fails when it encounters these and responds with
a usage message. With this patch msiexec handles them more gracefully
(it ignores them but succeeds), which allows for a complete installation
of InstMsiA.exe.

 -Hans

Changelog:
  Handle unknown parameters more gracefully.
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