[osg-submissions] Fix for allowing external management of cursors in GraphicsWindowWin32

[Jason Beverage]

Hi Robert,

The following changes fix the flickering issue I'm seeing when trying to
externally manage my cursor in Win32.  If you set the cursor to
InheritCursor, GraphicsWindowWin32 ignores WM_SETCURSOR and assumes you will
set the cursor yourself.

Thanks!

Jason
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