fix build on windows

Author: rjonaitis

cli/utilities/frontendDelayTest.cpp

@@ -4,7 +4,6 @@
 #include "limesuiteng/OpStatus.h"
 #include <iostream>
 #include <chrono>
-#include <cmath>
 #include <signal.h>
 #include <thread>
 #include <condition_variable>
@@ -17,6 +16,9 @@
 #include "../src/DSP/math/math.h"
 #include "../src/utilities/WorkerThread.h"
 
+#define _USE_MATH_DEFINES
+#include <math.h>
+
 #define USE_GNU_PLOT 1
 #ifdef USE_GNU_PLOT
     #include "gnuPlotPipe.h"