Add math.h for cwsender

cwsender.h

@@ -6,10 +6,12 @@
 #include <QFont>
 #include <QInputDialog>
 #include <QMessageBox>
+#include <math.h>
 #include "wfviewtypes.h"
 #include "logcategories.h"
 
 
+
 namespace Ui {
 class cwSender;
 }