user32/tests: Test the behavior of DialogBoxParamA with dialog procedure window destruction.

[Andrew Nguyen]

This reveals the issue described in bug 19495, and the tests were run
successfully on Windows XP.
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 dlls/user32/tests/dialog.c |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)
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