PATCH: DirectDraw vtable fixes

[Matthew Bloch]

Found it; a few of the DirectDraw ICOM_VTABLE declarations did not have the 
ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE macro prefixing their elements.  This 
meant that, well, all sorts of havoc broke loose when wrong functions were 
called :)  I hope this is an uncontentious patch attached.