ArduinoAddons has been removed from Marlin, remove any references to it.
Replace HARDWARE_SRC and HARDWARE_DIR with its expanded equivalents.
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Instantiation of the static singleton instance thermalManager in general
requires locking, but we know its safe to do without.
Add -fno-threadsafe-statics to avoid using locking primitives, which
result in linking errors:
undefined reference to `__cxa_guard_acquire'
undefined reference to `__cxa_guard_release'
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>