msi: Allow private properties from the AdminProperties property list.

[James Hawkins]

Fixes bug 15816.  http://bugs.winehq.org/show_bug.cgi?id=15816

---
 dlls/msi/action.c        |   10 +++++++---
 dlls/msi/msipriv.h       |    3 ++-
 dlls/msi/package.c       |    2 +-
 dlls/msi/tests/install.c |    5 +++--
 4 files changed, 13 insertions(+), 7 deletions(-)
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