[sbs] added -DNDEBUG for flight binaries

sbs.conf

@@ -225,7 +225,7 @@ BoardId:    stm32f429zi_skyward_death_stack_x
 BinName:    death-stack-x-entry
 Libs:       fmt eigen
 Include:    %shared %deathstack-new %math %ubloxgps %pwm %hbridge %spi %xbee %servo %sensormanager %ads1118 %ms5803 %bmx160 %bmx160withcorrection %internal-adc %calibration
-Defines:    -DFLIGHT -DROCCARASO
+Defines:    -DFLIGHT -DROCCARASO -DNDEBUG
 Main:       death-stack-x-entry
 
 [death-stack-x-testsuite]