msi: Set the PackageCode property based on the "revision number" data in the summary information.

[Robert Shearman]

Add a test to show that PackageCode is set by MSI.
---
  dlls/msi/package.c       |   41 ++++++++++++++++++++++++++++++++---------
  dlls/msi/tests/package.c |    5 +++++
  2 files changed, 37 insertions(+), 9 deletions(-)
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