[1/2] winex11: select StructureNotifyMask input on all windows

[Vincent Povirk]

We have a MapNotify handler in Wine so that we can focus a
newly-mapped unmanaged window when, internally, we already consider it
focused. However, we do not select for StructureNotifyMask input on
unmanaged windows so we never get MapNotify events on them. This patch
corrects that.

With the patch applied, I can start notepad in unmanaged mode and
immediately type into the window.

Vincent Povirk