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Last-ditch maximum size limit for Tracks

This makes sure that width * height <= INT_MAX, which it rather needs
to be.

--- a/tracks.c

+++ b/tracks.c

@@ -20,6 +20,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -196,6 +197,8 @@

      */

     if (params->w < 4 || params->h < 4)

         return "Width and height must both be at least four";

+    if (params->w > INT_MAX / params->h)

+        return "Width times height must not be unreasonably large";

     return NULL;

 }