PX4_ISFINITE use builtin everywhere

src/drivers/kinetis/tone_alarm/ToneAlarmInterface.cpp

@@ -43,6 +43,7 @@
 #include <px4_defines.h>
 #include <systemlib/px4_macros.h>
 
+#include <cmath>
 
 #define CAT3_(A, B, C)    A##B##C
 #define CAT3(A, B, C)     CAT3_(A, B, C)

src/drivers/px4fmu/fmu.cpp

@@ -38,6 +38,7 @@
  */
 
 #include <float.h>
+#include <math.h>
 
 #include <board_config.h>
 #include <drivers/device/device.h>

src/drivers/stm32/tone_alarm/ToneAlarmInterface.cpp

@@ -38,6 +38,7 @@
 #include <drivers/device/device.h>
 #include <lib/drivers/tone_alarm/ToneAlarmInterface.h>
 #include <px4_defines.h>
+#include <cmath>
 
 /* Check that tone alarm and HRT timers are different */
 #if defined(TONE_ALARM_TIMER) && defined(HRT_TIMER)