waf: support no-gcs and DAL builds

Tools/ardupilotwaf/ardupilotwaf.py

@@ -36,6 +36,7 @@ COMMON_VEHICLE_DEPENDENT_LIBRARIES = [
     'AP_InertialSensor',
     'AP_Math',
     'AP_Mission',
+    'AP_DAL',
     'AP_NavEKF',
     'AP_NavEKF2',
     'AP_NavEKF3',

Tools/ardupilotwaf/boards.py

@@ -64,6 +64,10 @@ class Board:
         else:
             cfg.options.disable_scripting = True
 
+        # allow GCS disable for AP_DAL example
+        if cfg.options.no_gcs:
+            env.CXXFLAGS += ['-DHAL_NO_GCS=1']
+            
         d = env.get_merged_dict()
         # Always prepend so that arguments passed in the command line get
         # the priority.