fix armcc backwards compatibility for inclusion of config header with old target descriptions
fix armcc backwards compatibility for inclusion of config header with old target descriptions

eyeye/yotta,ARMmbed/yotta,BlackstoneEngineering/yotta,autopulated/yotta,theotherjimmy/yotta,theotherjimmy/yotta,ARMmbed/yotta,eyeye/yotta,autopulated/yotta,ntoll/yotta,stevenewey/yotta,stevenewey/yotta,BlackstoneEngineering/yotta,ntoll/yotta