compilation failure on STM32 "Blue pill"

[gschintgen]

Hi, thanks for your library! It's the most advanced RTTTL library I could find and it works wonderfully on the Nano. But on a STM32 it won't compile due to a differing signature of the noTone function:

extern void noTone(uint8_t _pin, bool destruct = false);

https://github.com/stm32duino/Arduino_Core_STM32/blob/6f28a4884a77ffddc8bdc1e44a781b9f6cbccf08/cores/arduino/Tone.h#L37

The optional second argument breaks the asignment to _noTone:

.pio/libdeps/bluepill_f103c6/AnyRtttl/src/anyrtttl.cpp:70:25: error: invalid conversion from 'void (*)(uint8_t, bool)' {aka 'void (*)(unsigned char, bool)'} to 'anyrtttl::NoToneFuncPtr' {aka 'void (*)(unsigned char)'} [-fpermissive]
   70 | NoToneFuncPtr _noTone = &noTone;
      |                         ^~~~~~~
      |                         |
      |                         void (*)(uint8_t, bool) {aka void (*)(unsigned char, bool)}

For what it's worth, here's my simple fix:

/****************************************************************************
 * Custom functions
 ****************************************************************************/

// Arduino on STM32 (and potentially other platforms) defines
// noTone() with a second (optional) argument. This leads to
// compilation failures, unless the second argument is bound
// to its default value.
void noToneWrapper(uint8_t pin) {
  noTone(pin);
}

ToneFuncPtr _tone = &tone;
NoToneFuncPtr _noTone = &noToneWrapper;
DelayFuncPtr _delay = &delay;
MillisFuncPtr _millis = &millis;

(I can submit a proper PR if you want.)