Call std::terminate on pure or deleted virtual functions

These are special functions that are presumably put into vtables for
deleted or pure virtual functions. Previously, this would call `abort()`
directly, but calling `std::terminate()` achieves the same effect, but
allows user code to change the behavior (e.g. to print to serial, blink
leds or whatever makes sense).

Author: matthijskooijman

cores/arduino/abi.cpp

@@ -28,14 +28,9 @@ namespace std {
 }
 
 void __cxa_pure_virtual(void) {
-  // We might want to write some diagnostics to uart in this case
-  //std::terminate();
-  abort();
+  std::terminate();
 }
 
 void __cxa_deleted_virtual(void) {
-  // We might want to write some diagnostics to uart in this case
-  //std::terminate();
-  abort();
+  std::terminate();
 }
-