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OrRegionRegion -- Perform 2d OR operation of one region
with second region, leaving result in second region
status = OrRegionRegion(region1,region2)
d0 a0 a1
BOOL OrRegionRegion( struct Region *, struct Region * );
If any portion of region1 is not in the region then add
that portion to the region2
region1 - pointer to Region structure
region2 - pointer to Region structure
status - return TRUE if successful operation
return FALSE if ran out of memory
OrRectRegion(), <graphics/regions.h>
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