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Last-ditch maximum size limit for Magnets

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

--- a/magnets.c

+++ b/magnets.c

@@ -36,6 +36,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -232,6 +233,8 @@

 {

     if (params->w < 2) return "Width must be at least two";

     if (params->h < 2) return "Height must be at least two";

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

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

     if (params->diff >= DIFF_TRICKY) {

         if (params->w < 5 && params->h < 5)

             return "Either width or height must be at least five for Tricky";