replace <cfloat> with <float.h>

src/drivers/differential_pressure/ets/ets_airspeed.cpp

src/drivers/px4fmu/fmu.cpp

src/drivers/rc_input/RCInput.hpp

src/lib/mixer/mixer_multirotor.cpp

...odules/attitude_estimator_q/attitude_estimator_q_main.cpp

src/modules/commander/Commander.cpp

src/modules/ekf2/ekf2_main.cpp

src/modules/fw_pos_control_l1/FixedwingPositionControl.hpp

src/modules/gnd_pos_control/GroundRoverPositionControl.hpp

src/modules/land_detector/LandDetector.cpp

src/modules/navigator/geofence.h

src/modules/navigator/mission.h

src/modules/navigator/navigator_main.cpp

src/modules/vtol_att_control/vtol_type.cpp

src/systemcmds/tests/test_controlmath.cpp

src/systemcmds/tests/test_float.cpp