msi: Fix WHERE IS (NOT) NULL queries.

[Mike McCormack]

---
  dlls/msi/query.h    |    1 +
  dlls/msi/sql.y      |   18 ++++++++++++++++--
  dlls/msi/tests/db.c |    6 ++++++
  dlls/msi/where.c    |   35 +++++++++++++++++++++++++++++++----
  4 files changed, 54 insertions(+), 6 deletions(-)
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