Does not compile with GCC 11

[zeroos]

When trying to compile with GCC 11, I get the following error:

../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c: In function 'decktestSaveGPIOStatesABC':
../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c:61:3: error: 'memcpy' offset [0, 39] is out of the bounds [0, 0] [-Werror=array-bounds]
   61 |   memcpy(&gpioRegBuf->gpioBuffA, GPIOA, sizeof(GPIO_TypeDef));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c:62:3: error: 'memcpy' offset [0, 39] is out of the bounds [0, 0] [-Werror=array-bounds]
   62 |   memcpy(&gpioRegBuf->gpioBuffB, GPIOB, sizeof(GPIO_TypeDef));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c:63:3: error: 'memcpy' offset [0, 39] is out of the bounds [0, 0] [-Werror=array-bounds]
   63 |   memcpy(&gpioRegBuf->gpioBuffC, GPIOC, sizeof(GPIO_TypeDef));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c: In function 'decktestRestoreGPIOStatesABC':
../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c:69:3: error: 'memcpy' offset [0, 39] is out of the bounds [0, 0] [-Werror=array-bounds]
   69 |   memcpy(GPIOA, &gpioRegBuf->gpioBuffA, sizeof(GPIO_TypeDef));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c:70:3: error: 'memcpy' offset [0, 39] is out of the bounds [0, 0] [-Werror=array-bounds]
   70 |   memcpy(GPIOB, &gpioRegBuf->gpioBuffB, sizeof(GPIO_TypeDef));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../crazyflies/crazyflie-firmware/src/deck/core/deck_test.c:71:3: error: 'memcpy' offset [0, 39] is out of the bounds [0, 0] [-Werror=array-bounds]
   71 |   memcpy(GPIOC, &gpioRegBuf->gpioBuffC, sizeof(GPIO_TypeDef));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [../../../crazyflies/crazyflie-firmware/tools/make/targets.mk:27: deck_test.o] Error 1
make: *** [../../../crazyflies/crazyflie-firmware/Makefile:400: build] Error 2

[zeroos]

The discussion here seems related: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c1

They suggest that for now, the best solution is to make a compiler skip this check. They suggest two ways to do so. I'll make a PR that disables this warning in Makefile.