build_options.py: RateLoopThread is dependent on HarmonicNotches

"> AP_INERTIALSENSOR_FAST_SAMPLE_WINDOW_ENABLED should never be built without harmonic notch support, so we should express the dependency a different way if necessary rather than littering the code with extra defines"

Tools/scripts/build_options.py

@@ -345,7 +345,7 @@ def config_option(self):
     Feature('IMU', 'HarmonicNotches', 'AP_INERTIALSENSOR_HARMONICNOTCH_ENABLED', 'Enable InertialSensor harmonic notch filters', 0, None),  # noqa
     Feature('IMU', 'BatchSampler', 'AP_INERTIALSENSOR_BATCHSAMPLER_ENABLED', 'Enable Batch sampler', 0, None),  # noqa
 
-    Feature('Other', 'RateLoopThread', 'AP_INERTIALSENSOR_FAST_SAMPLE_WINDOW_ENABLED', 'Enable Rate Loop Thread', 0, None),  # noqa
+    Feature('Other', 'RateLoopThread', 'AP_INERTIALSENSOR_FAST_SAMPLE_WINDOW_ENABLED', 'Enable Rate Loop Thread', 0, 'HarmonicNotches'),  # noqa
     Feature('Other', 'GyroFFT', 'HAL_GYROFFT_ENABLED', 'Enable In-Flight gyro FFT calculations', 0, None),
     Feature('Other', 'NMEA_OUTPUT', 'HAL_NMEA_OUTPUT_ENABLED', 'Enable NMEA output', 0, None),
     Feature('Other', 'SDCARD_FORMATTING', 'AP_FILESYSTEM_FORMAT_ENABLED', 'Enable Formatting of microSD cards', 0, None),