replace <cfloat> with <float.h>

- <cfloat> isn't available in the NuttX c++ library

src/modules/navigator/geofence.h

@@ -40,7 +40,7 @@
 
 #pragma once
 
-#include <cfloat>
+#include <float.h>
 
 #include <px4_module_params.h>
 #include <drivers/drv_hrt.h>

src/modules/navigator/mission.h

@@ -48,7 +48,7 @@
 #include "mission_feasibility_checker.h"
 #include "navigator_mode.h"
 
-#include <cfloat>
+#include <float.h>
 
 #include <dataman/dataman.h>
 #include <drivers/drv_hrt.h>

src/modules/navigator/navigator_main.cpp

@@ -45,7 +45,7 @@
 
 #include "navigator.h"
 
-#include <cfloat>
+#include <float.h>
 #include <sys/stat.h>
 
 #include <dataman/dataman.h>