Add required math headers

Author: utelle

wxdemo/realtimemultithread/randomwalk.cpp

@@ -10,10 +10,11 @@
 **              and condition of the ChartDirector license.
 */
 
-#include "randomwalk.h"
-
 #include <wx/stopwatch.h>
 
+#include "randomwalk.h"
+#include <math.h>
+
 // The period of the data series in milliseconds. This random series implementation just use the 
 // windows timer for timing. In many computers, the default windows timer resolution is 1/64 sec,
 // or 15.6ms. This means the interval may not be exactly accurate.

wxdemo/realtimesweep/randomwave.cpp

@@ -13,6 +13,7 @@
 #include <wx/stopwatch.h>
 
 #include "randomwave.h"
+#include <math.h>
 
 // The period of the data series in milliseconds. This random series implementation just use the 
 // windows timer for timing. In many computers, the default windows timer resolution is 1/64 sec,