XBridge: Use const void * instead of uintptr_t for member size in calloc call.

MacOSX/AuXBridge.mm

@@ -81,7 +81,7 @@ void bridge_helper_cppify_dict(NSDictionary *changedKeys, WTDictionary *properti
 			properties->set([key UTF8String], [val pointerValue]);
 		else if([val isKindOfClass:[NSArray class]])
 		{
-			const void **array = static_cast<const void **>(calloc(sizeof(uintptr_t), [val count]));
+			const void **array = static_cast<const void **>(calloc(sizeof(const void *), [val count]));
 			NSUInteger next_obj = 0;
 			for(; next_obj < [val count]; next_obj++)
 			{