replace <cfloat> with <float.h>

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

EKF/optflow_fusion.cpp

@@ -43,7 +43,7 @@
 #include "ekf.h"
 #include <ecl.h>
 #include <mathlib/mathlib.h>
-#include <cfloat>
+#include <float.h>
 
 void Ekf::fuseOptFlow()
 {

geo/geo.cpp

@@ -47,7 +47,7 @@
 
 #include <mathlib/mathlib.h>
 #include <matrix/math.hpp>
-#include <cfloat>
+#include <float.h>
 
 using matrix::wrap_pi;
 using matrix::wrap_2pi;

validation/data_validator_group.cpp

@@ -41,7 +41,7 @@
 
 #include "data_validator_group.h"
 #include <ecl.h>
-#include <cfloat>
+#include <float.h>
 
 DataValidatorGroup::DataValidatorGroup(unsigned siblings)
 {