Tools: whitelist AP_PLANE_BLACKBOX_LOGGING

no signature we can use for this

Tools/scripts/extract_features.py

@@ -200,6 +200,7 @@ class ExtractFeatures(object):
         # a list of problematic defines we don't have fixes for ATM:
         whitelist = frozenset([
             'HAL_PERIPH_SUPPORT_LONG_CAN_PRINTF',  # this define changes single method body, hard to detect?
+            'AP_PLANE_BLACKBOX_LOGGING', # no visible signature
         ])
         for option in build_options.BUILD_OPTIONS:
             if option.define in whitelist: