UniRec output plugin: added missing header file <math.h>

Author: Lukas955

extra_plugins/output/unirec/src/translator.c

@@ -42,6 +42,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <inttypes.h>
+#include <math.h>
 
 #include "translator.h"
 #include "fields.h"