waf: make AP_NavEKF3_core.h a vehicle dependent include

Tools/ardupilotwaf/ap_library.py

@@ -51,8 +51,10 @@ def _vehicle_index(vehicle):
         _vehicle_indexes[vehicle] = len(_vehicle_indexes) + 1
     return _vehicle_indexes[vehicle]
 
-_vehicle_macros = ('SKETCHNAME', 'SKETCH', 'APM_BUILD_DIRECTORY',
-                   'APM_BUILD_TYPE')
+# note that AP_NavEKF3_core.h is needed for AP_NavEKF3_feature.h
+_vehicle_macros = ['SKETCHNAME', 'SKETCH', 'APM_BUILD_DIRECTORY',
+                   'APM_BUILD_TYPE',
+                   'AP_NavEKF3_core.h']
 _macros_re = re.compile(r'\b(%s)\b' % '|'.join(_vehicle_macros))
 
 def _remove_comments(s):
@@ -159,6 +161,7 @@ class ap_library_check_headers(Task.Task):
         'libraries/AP_Camera/AP_RunCam.h',
         'libraries/AP_Common/AP_FWVersionDefine.h',
         'libraries/AP_Scripting/lua_generated_bindings.h',
+        'libraries/AP_NavEKF3/AP_NavEKF3_feature.h',
     )
     whitelist = tuple(os.path.join(*p.split('/')) for p in whitelist)