fix complilation error with newers versions of cs's gcc

  [CC]        ./libmaple/usbF4/VCP/usbd_cdc_vcp.c
/home/rgorosito/git/AeroQuad/Libmaple/libmaple/libmaple/usbF4/VCP/usbd_cdc_vcp.c: In function 'systemHardReset':
/home/rgorosito/git/AeroQuad/Libmaple/libmaple/libmaple/usbF4/VCP/usbd_cdc_vcp.c:258:20: error: typedef 'funcPtr' locally defined but not used [-Werror=unused-local-typedefs]
     typedef void (*funcPtr)(void);
                    ^
cc1: all warnings being treated as errors
make: *** [build/./libmaple/usbF4/VCP/usbd_cdc_vcp.o] Error 1
make: se sale del directorio `/home/rgorosito/git/AeroQuad/Libmaple/libmaple'
make: se ingresa al directorio `/home/rgorosito/git/AeroQuad/BuildAQ32'