USER32: Hide cursor when calling SetCursor with NULL HCURSOR

[Justin Chevrier]

I've been doing a little work trying to brush up a few rough edges in Master 
of Orion 2. One issue that was obvious was that the X cursor was always over 
top of the in game cursor, In Windows the system cursor is hidden. So I did a 
little investigation and found that if SetCursor is called with a NULL 
HCURSOR the cursor should be hidden. We were not handling this case. The 
following patch corrects this and properly hides the cursor in Master of 
Orion 2.

Changelog:
Hide cursor if SetCursor is called with a NULL HCURSOR
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