AP_RangeFinder: disable old rangefinder drivers

these will be re-enabled when they are converted to the new class API

libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarI2CXL.cpp

@@ -31,6 +31,7 @@
  *
  */
 
+#if 0
 // AVR LibC Includes
 #include "AP_RangeFinder_MaxsonarI2CXL.h"
 #include <AP_HAL.h>
@@ -87,3 +88,4 @@ int16_t AP_RangeFinder_MaxsonarI2CXL::read()
     
     return ret_value;
 }
+#endif

libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarXL.cpp

@@ -1,3 +1,4 @@
+#if 0
 // -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 /*
    This program is free software: you can redistribute it and/or modify
@@ -75,3 +76,5 @@ float AP_RangeFinder_MaxsonarXL::calculate_scaler(int16_t sonar_type, float adc_
     _scaler = type_scaler * adc_refence_voltage / 5.0f;
     return _scaler;
 }
+
+#endif

libraries/AP_RangeFinder/AP_RangeFinder_PulsedLightLRF.cpp

@@ -1,3 +1,4 @@
+#if 0
 // -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 /*
    This program is free software: you can redistribute it and/or modify
@@ -126,3 +127,4 @@ int16_t AP_RangeFinder_PulsedLightLRF::read()
     // to-do: do we really want to return 0 if reading the distance fails?
     return ret_value;
 }
+#endif

libraries/AP_RangeFinder/AP_RangeFinder_SharpGP2Y.cpp

@@ -1,3 +1,4 @@
+#if 0
 // -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 /*
    This program is free software: you can redistribute it and/or modify
@@ -47,3 +48,4 @@ AP_RangeFinder_SharpGP2Y::AP_RangeFinder_SharpGP2Y(AP_HAL::AnalogSource *source,
 }
 
 // Public Methods //////////////////////////////////////////////////////////////
+#endif