Copter: remove checking for coordinate frames

This is very much NFC.  This change uncovers previous dead code in the
case that we are not ignoring yaw.

ArduCopter/GCS_Mavlink.cpp

@@ -1137,16 +1137,6 @@ void GCS_MAVLINK_Copter::handleMessage(mavlink_message_t* msg)
             break;
         }
 
-        // check for supported coordinate frames
-        if (packet.coordinate_frame != MAV_FRAME_GLOBAL &&
-            packet.coordinate_frame != MAV_FRAME_GLOBAL_INT &&
-            packet.coordinate_frame != MAV_FRAME_GLOBAL_RELATIVE_ALT && // solo shot manager incorrectly sends RELATIVE_ALT instead of RELATIVE_ALT_INT
-            packet.coordinate_frame != MAV_FRAME_GLOBAL_RELATIVE_ALT_INT &&
-            packet.coordinate_frame != MAV_FRAME_GLOBAL_TERRAIN_ALT &&
-            packet.coordinate_frame != MAV_FRAME_GLOBAL_TERRAIN_ALT_INT) {
-            break;
-        }
-
         bool pos_ignore      = packet.type_mask & MAVLINK_SET_POS_TYPE_MASK_POS_IGNORE;
         bool vel_ignore      = packet.type_mask & MAVLINK_SET_POS_TYPE_MASK_VEL_IGNORE;
         bool acc_ignore      = packet.type_mask & MAVLINK_SET_POS_TYPE_MASK_ACC_IGNORE;