msi: Add stub implementation of MsiIsProductElevatedA/W.

[Robert Shearman]

---
  dlls/msi/msi.c    |   22 ++++++++++++++++++++++
  dlls/msi/msi.spec |    4 ++--
  include/msi.h     |    4 ++++
  3 files changed, 28 insertions(+), 2 deletions(-)

This is needed by Office 2007.
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