Fix for C++ 14 delete operator

See: https://isocpp.org/files/papers/n3778.html

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/new.cpp

@@ -34,3 +34,10 @@ void operator delete[](void * ptr) {
   free(ptr);
 }
 
+void operator delete(void * ptr, size_t /*size*/) {
+  free(ptr);
+}
+
+void operator delete[](void * ptr, size_t /*size*/) {
+  free(ptr);
+}