Added delete operators to comply with new gcc [C++17]

[kpochwala]

Earlier, when compiled with -fsized-deallocation warning enabled, this file caused problems. I also added noexcept specifier. Now it compiles with gcc 7.2 and -std=gnu++17 without problems.

[matthijskooijman]

Is noexcept needed? We're always running with -fno-exceptions, so noexcept might not be needed, or even wrong (not sure)? There is some previous discussion on a related subject in #108.

Can you be a bit more explicit about what problems you were running in without this delete operator? Is this operator new in C++17, or is there something in C++17 that makes it needed while it was not before?

[facchinm]

Hi @kpochwala ,
we are closing all the hardware related PRs in this repo.
If you are still interesting in getting this merged could you reopen in https://github.com/arduino/ArduinoCore-avr ? Here you can find some hints about reapplying the patch to that repo easily.
Thanks!