MSI: Improve MsiUseFeatureEx and MsiGetFeatureState a little, add some simple test cases.

[Mike McCormack]

ChangeLog:
Improve MsiUseFeatureEx and MsiGetFeatureState a little, add some simple 
test cases.

  dlls/msi/msi.c             |   61 +++++++++++++++++++----------------
  dlls/msi/tests/Makefile.in |    1 +
  dlls/msi/tests/msi.c       |   76 
++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 109 insertions(+), 29 deletions(-)
  create mode 100644 dlls/msi/tests/msi.c

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