remove now unused callbacks

DcCore/DcCore/DC/wrapper.c

@@ -1,9 +1,3 @@
 #include "wrapper.h"
 
-void callbackSwift(int, long, long, const char*, const char*);
-
-uintptr_t callback_ios(dc_context_t* mailbox, int event, uintptr_t data1, uintptr_t data2)
-{
-    callbackSwift(event, data1, data2, data1? (const char*)data1 : "", data2? (const char*)data2 : "");
-    return 0;
-}
+// if needed, add c-related wrapper functions here

DcCore/DcCore/DC/wrapper.h

@@ -13,6 +13,4 @@ typedef dc_lot_t dc_lot_t;
 typedef dc_array_t dc_array_t;
 typedef dc_chatlist_t dc_chatlist_t;
 
-uintptr_t callback_ios(dc_context_t* mailbox, int event, uintptr_t data1, uintptr_t data2);
-
 #endif /* wrapper_h */