Interface: Add casts to memcpy/memset invocations on BPoint & BRect.

Their copy constructors are exactly what GCC would generate,
but we can't remove them because doing so would make them
trivially copyable, and so they would be passed in registers
on x86_64, an ABI breakage.

So instead we have to add explicit casts to void* here.

headers/private/interface/ShapePrivate.h

@@ -61,8 +61,8 @@ public:
 		opSize = other.opSize;
 		ptCount = other.ptCount;
 		ptSize = other.ptSize;
-		memcpy(opList, other.opList, opSize);
-		memcpy(ptList, other.ptList, ptSize);
+		memcpy((void*)opList, other.opList, opSize);
+		memcpy((void*)ptList, other.ptList, ptSize);
 	}
 
 	BRect DetermineBoundingBox() const