Create DIALOGINFO On Demand When Calling DIALOG_get_info

[Robert Shearman]

Hi,

This patch fixes bug 2210:
http://bugs.winehq.org/show_bug.cgi?id=2210
This patch differs slightly from the one posted to wine-devel, as it
includes some checks for NULL return from DIALOG_get_info.

Rob

Changelog:
Create DIALOGINFO on demand when calling DIALOG_get_info

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