Disable a test as it is not consistent between compilers.

source/math_helper.cpp

@@ -62,4 +62,9 @@ double max3(double a, double b, double c)
         if (c > b) return c;
     }
     return b;
+}
+
+double frand()
+{
+    return rand() / ((double) RAND_MAX);
 }