winuser.h needs MOUSEEVENTF_WHEEL (0x0800) to be
defined. Also, the MS documentation refers to VK_A -
VK_Z and VK_0 - VK_9 a lot, but not sure if they should
be defined, they don't seem to be in the MS winuser.h.
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I have added the MOUSEEVENTF_WHEEL and committed to SF CVS.
I did not add the VK_A - VK_Z and VK_0 - VK_9 defines
because I did not think they were necessary. They are
pretty obvious, aren't they?