Fixing issue #34: Several ifdefs missing in midi_devices.hpp

Thanks to @dronus!

midi_devices.hpp

@@ -1732,9 +1732,15 @@ void send_sysex_voice(uint8_t midi_channel, uint8_t* data)
 
 void send_sysex_bank(uint8_t midi_channel, uint8_t* bank_data)
 {
+#ifdef MIDI_DEVICE_DIN
   midi_serial.sendSysEx(4104, bank_data); // Send to DIN MIDI
+#endif
+#ifdef MIDI_DEVICE_USB
   midi_usb.sendSysEx(4104, bank_data); // Send to USB MIDI
+#endif
+#ifdef MIDI_DEVICE_USB_HOST
   usbMIDI.sendSysEx(4104, bank_data); // Send to USB-HOST MIDI
+#endif
 }
 
 void send_sysex_param(uint8_t midi_channel, uint8_t var, uint8_t val, uint8_t param_group)
@@ -1755,9 +1761,15 @@ void send_sysex_param(uint8_t midi_channel, uint8_t var, uint8_t val, uint8_t pa
   }
   s[4] = val & 0x7f;
 
+#ifdef MIDI_DEVICE_DIN
   midi_serial.sendSysEx(5, s); // Send to DIN MIDI
+#endif
+#ifdef MIDI_DEVICE_USB
   midi_usb.sendSysEx(5, s); // Send to USB MIDI
+#endif
+#ifdef MIDI_DEVICE_USB_HOST
   usbMIDI.sendSysEx(5, s); // Send to USB-HOST MIDI
+#endif
 }
 
 #endif // MIDI_DEVICES_H