warnings: don't spam with warning for missing field initializer

makefiles/toolchain_gnu-arm-eabi.mk

 #
-#   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+#   Copyright (C) 2012-2014 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -142,7 +142,8 @@ ARCHCWARNINGS		 = $(ARCHWARNINGS) \
 
 # C++-specific warnings
 #
-ARCHWARNINGSXX		 = $(ARCHWARNINGS)
+ARCHWARNINGSXX		 = $(ARCHWARNINGS) \
+			   -Wno-missing-field-initializers
 
 # pull in *just* libm from the toolchain ... this is grody
 LIBM			:= $(shell $(CC) $(ARCHCPUFLAGS) -print-file-name=libm.a)